1001 toán tư duy lớp 4

["1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 14. C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng trong h\u00ecnh sau? C\u00e2u 15. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? A. 12 \u0111o\u1ea1n th\u1eb3ng B. 15 \u0111o\u1ea1n th\u1eb3ng C. 18 \u0111o\u1ea1n th\u1eb3ng C\u00e2u 16. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? A. 9 \u0111o\u1ea1n th\u1eb3ng B. 7 \u0111o\u1ea1n th\u1eb3ng C. 8 \u0111o\u1ea1n th\u1eb3ng 101","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 17. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? A. 12 \u0111o\u1ea1n th\u1eb3ng B. 24 \u0111o\u1ea1n th\u1eb3ng C. 19 \u0111o\u1ea1n th\u1eb3ng C\u00e2u 18. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? A. 9 \u0111o\u1ea1n th\u1eb3ng B. 4 \u0111o\u1ea1n th\u1eb3ng C. 10 \u0111o\u1ea1n th\u1eb3ng C\u00e2u 19. T\u00ednh nhanh: 248 \u2013 242 + 240 \u2013 234 + 232 \u2013 226 + ... + 216 \u2013 210 102","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 20. T\u00ednh nhanh: 191 \u2013 189 + 190 \u2013 188 + 189 \u2013 187 + ... + 187 - 185 C\u00e2u 21. H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang! C\u00e2u 22. T\u00ecm gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed7i \u0111\u1ed3 v\u1eadt. C\u00e2u 23. Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang. 103","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 24. T\u00ecm gi\u00e1 tr\u1ecb m\u1ed7i \u0111\u1ed3 v\u1eadt. C\u00e2u 25. Anh, Ph\u00e1p v\u00e0 Canada l\u00e0 3 n\u01a1i \u0111i du h\u1ecdc c\u1ee7a 3 b\u1ea1n Kim, Ly v\u00e0 An. Bi\u1ebft r\u1eb1ng An ch\u01b0a t\u1eebng \u0111i \u0111\u1ebfn Canada. Ly kh\u00f4ng \u0111i du h\u1ecdc \u1edf Ph\u00e1p v\u00e0 Canada. T\u00ecm \u0111\u1ea5t n\u01b0\u1edbc m\u00e0 b\u1ea1n Kim \u0111\u00e3 \u0111i du h\u1ecdc. C\u00e2u 26. H\u00f9ng, Hu\u1ec7 v\u00e0 H\u00e0 trong ba ng\u01b0\u1eddi c\u00f3 ng\u01b0\u1eddi r\u1ea5t th\u00edch ph\u1edf, c\u00f3 ng\u01b0\u1eddi th\u00edch c\u01a1m t\u1ea5m v\u00e0 ng\u01b0\u1eddi c\u00f2n l\u1ea1i r\u1ea5t th\u00edch \u0103n h\u1ee7 ti\u1ebfu. Bi\u1ebft r\u1eb1ng: Hu\u1ec7 kh\u00f4ng th\u00edch \u0103n m\u00f3n c\u00f3 n\u01b0\u1edbc. H\u00e0 l\u1ea1i kh\u00f4ng th\u00edch \u0103n h\u1ee7 ti\u1ebfu v\u00e0 c\u01a1m t\u1ea5m. V\u1eady b\u1ea1n H\u00f9ng th\u00edch \u0103n m\u00f3n n\u00e0o? 104","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 27. Kh\u00f4ng th\u1ea5y m\u1ed9t c\u00e1i b\u00e1nh d\u00e2u trong t\u1ee7 l\u1ea1nh, m\u1eb9 nghi ng\u1edd m\u1ed9t trong nh\u1eefng \u0111\u1ee9a tr\u1ebb l\u1ea5y m\u1ea5t c\u00e1i b\u00e1nh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e2u h\u1ecfi c\u1ee7a ch\u00fang khi m\u1eb9 h\u1ecfi m\u1ed7i \u0111\u1ee9a. Andy: Con kh\u00f4ng l\u1ea5y b\u00e1nh \u0111\u00e2u! Cindy: Con c\u00f2n kh\u00f4ng bi\u1ebft m\u1eb9 mua b\u00e1nh n\u1eefa c\u01a1! Jack: Andy \u0111\u00e3 l\u1ea5y b\u00e1nh \u0111\u1ea5y \u1ea1! N\u1ebfu m\u1ed9t trong 3 b\u1ea1n n\u00f3i th\u1eadt, th\u00ec ai \u0111\u00e3 l\u1ea5y chi\u1ebfc b\u00e1nh? C\u00e2u 28. Sean, Karen, Susan v\u00e0 Kelvin \u0111ang so s\u00e1nh chi\u1ec1u cao v\u1edbi nhau: Sean: T\u1edb l\u00e0 ng\u01b0\u1eddi cao nh\u1ea5t. Karen: T\u1edb kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi th\u1ea5p nh\u1ea5t. Susan: T\u1edb kh\u00f4ng cao b\u1eb1ng Sean nh\u01b0ng v\u1eabn c\u00f3 b\u1ea1n th\u1ea5p h\u01a1n t\u1edb. Kelvin: T\u1edb l\u00e0 ng\u01b0\u1eddi th\u1ea5p nh\u1ea5t.. N\u1ebfu 1 trong s\u1ed1 h\u1ecd n\u00f3i d\u1ed1i, th\u00ec em h\u00e3y s\u1eafp x\u1ebfp chi\u1ec1u cao c\u1ee7a h\u1ecd theo th\u1ee9 t\u1ef1 t\u1eeb cao \u0111\u1ebfn th\u1ea5p. 105","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 29. \u00d4ng Simon ph\u00e1t hi\u1ec7n ra c\u00f3 ai \u0111\u00f3 \u0111\u00e3 l\u00e0m v\u1ee1 c\u1eeda s\u1ed5 c\u1ee7a nh\u00e0 \u00f4ng. Khi \u0111\u01b0\u1ee3c h\u1ecfi, c\u00e1c b\u1ea1n nh\u1ecf \u0111\u00e3 tr\u1ea3 l\u1eddi nh\u01b0 sau: Jack: Joe \u0111\u00e3 l\u00e0m \u0111\u1ea5y \u1ea1! Mary: Ch\u00e1u c\u00f2n kh\u00f4ng bi\u1ebft c\u1eeda s\u1ed5 \u0111\u00e3 v\u1ee1 \u0111\u1ea5y \u1ea1! Joe: Jack \u0111\u00e3 l\u00e0m \u0111\u1ea5y \u1ea1! N\u1ebfu ch\u1ec9 c\u00f3 1 \u0111\u1ee9a tr\u1ebb n\u00f3i th\u1eadt, th\u00ec ai \u0111\u00e3 l\u00e0m v\u1edf c\u1eeda s\u1ed5? C\u00e2u 30. Trong l\u1edbp h\u1ecdc, c\u00f3 ai \u0111\u00f3 \u0111\u00e3 x\u1ea3 r\u00e1c ra ph\u00f2ng h\u1ecdc. C\u00f4 gi\u00e1o \u0111\u00e3 r\u00fat g\u1ecdn \u0111\u01b0\u1ee3c 3 \u0111\u1ed1i t\u01b0\u1ee3ng t\u00ecnh nghi. V\u00e0 khi h\u1ecfi, ba b\u1ea1n \u0111\u00e3 tr\u1ea3 l\u1eddi nh\u01b0 sau: Joshua: Em kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi \u0111\u00e3 x\u1ea3 r\u00e1c \u1ea1! Paul: C\u0169ng kh\u00f4ng ph\u1ea3i em \u1ea1! James: Joshua \u0111\u00e3 n\u00e9m \u0111\u1ea5y \u1ea1! N\u1ebfu 1 trong s\u1ed1 h\u1ecd n\u00f3i th\u1eadt th\u00ec ai \u0111\u00e3 x\u1ea3 r\u00e1c ra ph\u00f2ng? 106","\u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 6 1B 6A 11A 16C 21C 26A 2D 7A 12C 17A 22B 27A 3B 8A 13A 18C 23B 28C 4B 9B 14C 19C 24C 29A 5A 10C 15B 20C 25B 30B T\u1ea3i App Hoc247 Kids \u0111\u1ec3 xem video h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft nh\u00e9! 107","CH\u1ee6 \u0110\u1ec0 7: TU\u1ed4I T\u00c1C. S\u1eec D\u1ee4NG S\u01a0 \u0110\u1ed2. TH\u1eeaA V\u00c0 THI\u1ebeU Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb B\u00e0i to\u00e1n t\u00ednh tu\u1ed5i - D\u1ea1ng 1: B\u00e0i to\u00e1n gi\u1ea3i b\u1eb1ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n T\u1ed5ng - hi\u1ec7u. V\u00ed d\u1ee5: N\u0103m nay, anh 11 tu\u1ed5i c\u00f2n em 5 tu\u1ed5i. H\u1ecfi sau bao nhi\u00eau n\u0103m n\u1eefa th\u00ec t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i? PH\u00c2N T\u00cdCH T\u1eeb s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em hi\u1ec7n nay, ta c\u00f3 th\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em t\u1eeb \u0111\u00f3 suy ra hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em khi t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i. \u00c1p d\u1ee5ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n T\u1ed5ng - hi\u1ec7u ta t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1ed7i ng\u01b0\u1eddi khi t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i, t\u1eeb \u0111\u00f3 t\u00ecm \u0111\u01b0\u1ee3c th\u1eddi gian t\u1eeb nay \u0111\u1ebfn khi t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i. B\u00c0I GI\u1ea2I Hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em hi\u1ec7n nay l\u00e0: 11 - 5 = 6 (tu\u1ed5i) Do hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai ng\u01b0\u1eddi lu\u00f4n kh\u00f4ng thay \u0111\u1ed5i n\u00ean hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em khi t\u1ed5ng s\u1ed1 tu\u1ed5\u1ec9 c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i c\u0169ng v\u1eabn nh\u01b0 hi\u1ec7n nay v\u00e0 l\u00e0 6 tu\u1ed5i. 108","Tu\u1ed5i c\u1ee7a anh khi t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i l\u00e0: (28 + 6) : 2 = 17 (tu\u1ed5i) Th\u1eddi gian t\u1eeb nay \u0111\u1ebfn khi t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai anh em l\u00e0 28 tu\u1ed5i l\u00e0: 17 - 11 = 6 (n\u0103m) \u0110\u00e1p s\u1ed1: 6 n\u0103m - D\u1ea1ng 2: B\u00e0i to\u00e1n gi\u1ea3i b\u1eb1ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n T\u1ed5ng \u2013 t\u1ec9. V\u00ed d\u1ee5: C\u00e1ch \u0111\u00e2y 5 n\u0103m, tu\u1ed5i m\u1eb9 g\u1ea5p 5 l\u1ea7n tu\u1ed5i con. T\u00ednh tu\u1ed5i m\u1eb9 v\u00e0 tu\u1ed5i con hi\u1ec7n nay, bi\u1ebft r\u1eb1ng t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 con hi\u1ec7n nay l\u00e0 46 tu\u1ed5i. PH\u00c2N T\u00cdCH B\u00e0i to\u00e1n cho bi\u1ebft t\u1ec9 s\u1ed1 s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con c\u00e1ch \u0111\u00e2y 5 n\u0103m v\u00e0 t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con hi\u1ec7n nay. \u0110\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1ed7i ng\u01b0\u1eddi ta c\u1ea7n bi\u1ebft th\u00eam t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con c\u00e1ch \u0111\u00e2y 5 n\u0103m ho\u1eb7c t\u1ec9 s\u1ed1 s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con hi\u1ec7n nay. Ta th\u1ea5y: T\u1eeb t\u1ec9 s\u1ed1 s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con c\u00e1ch \u0111\u00e2y 5 n\u0103m kh\u00f4ng th\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c t\u1ec9 s\u1ed1 s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con hi\u1ec7n nay. T\u1eeb t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 c\u1ee7a con hi\u1ec7n nay ta c\u00f3 th\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c t\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 c\u1ee7a con c\u00e1ch \u0111\u00e2y 5 n\u0103m. T\u1eeb \u0111\u00f3 \u00e1p d\u1ee5ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n T\u1ed5ng - t\u1ec9 ta t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 s\u1ed1 tu\u1ed5i c\u1ee7a con c\u00e1ch \u0111\u00e2y 5 n\u0103m v\u00e0 t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 s\u1ed1 tu\u1ed5i c\u1ee7a con hi\u1ec7n nay. 109","B\u00c0I GI\u1ea2I T\u1ed5ng s\u1ed1 tu\u1ed5i c\u1ee7a hai m\u1eb9 con c\u00e1ch \u0111\u00e2y 5 n\u0103m l\u00e0: 46 - 5 x 2 = 36 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a con c\u00e1ch \u0111\u00e2y 5 n\u0103m l\u00e0: 36 : (5 + 1) = 6 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a con hi\u1ec7n nay l\u00e0: 6 + 5 = 11 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a m\u1eb9 hi\u1ec7n nay l\u00e0: 46 - 11 = 35 (tu\u1ed5i) \u0110\u00e1p s\u1ed1: M\u1eb9: 35 tu\u1ed5i, con: 11 tu\u1ed5i. - D\u1ea1ng 3: B\u00e0i to\u00e1n gi\u1ea3i b\u1eb1ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n Hi\u1ec7u \u2013 t\u1ec9. V\u00ed d\u1ee5: M\u1eb9 sinh con n\u0103m 26 tu\u1ed5i. T\u00ednh tu\u1ed5i m\u1eb9 v\u00e0 tu\u1ed5i con hi\u1ec7n nay, bi\u1ebft r\u1eb1ng 15 n\u0103m n\u1eefa th\u00ec tu\u1ed5i m\u1eb9 s\u1ebd g\u1ea5p \u0111\u00f4i tu\u1ed5i con. PH\u00c2N T\u00cdCH M\u1eb9 sinh con n\u0103m 26 tu\u1ed5i t\u1ee9c l\u00e0 m\u1eb9 h\u01a1n con 26 tu\u1ed5i. Do \u0111\u00f3 sau 15 n\u0103m n\u1eefa m\u1eb9 v\u1eabn h\u01a1n con 26 tu\u1ed5i. B\u00e0i to\u00e1n cho bi\u1ebft t\u1ec9 s\u1ed1 s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 con sau 15 n\u0103m n\u1eefa, t\u1eeb \u0111\u00f3 \u00e1p d\u1ee5ng c\u00e1ch gi\u1ea3i c\u1ee7a b\u00e0i to\u00e1n Hi\u1ec7u - t\u1ec9 ta t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 s\u1ed1 tu\u1ed5i c\u1ee7a con sau 15 n\u0103m n\u1eefa v\u00e0 t\u00ecm \u0111\u01b0\u1ee3c s\u1ed1 tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 s\u1ed1 tu\u1ed5i c\u1ee7a con hi\u1ec7n nay. 110","B\u00c0I GI\u1ea2I M\u1eb9 sinh con n\u0103m 26 tu\u1ed5i v\u1eady m\u1eb9 h\u01a1n con 26 tu\u1ed5i. Do \u0111\u00f3 15 n\u0103m n\u1eefa m\u1eb9 c\u0169ng h\u01a1n con 26 tu\u1ed5i. Tu\u1ed5i c\u1ee7a con sau 15 n\u0103m n\u1eefa l\u00e0: 26 : (2 - 1) = 26 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a con hi\u1ec7n nay l\u00e0: 26 - 15 = 11 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a m\u1eb9 hi\u1ec7n nay l\u00e0: 11 + 26 = 37 (tu\u1ed5i) \u0110\u00e1p s\u1ed1: M\u1eb9: 37 tu\u1ed5i, con: 11 tu\u1ed5i. B\u00e0i to\u00e1n t\u1ed5ng b\u1ed9i V\u00ed d\u1ee5: C\u00f3 73 qu\u1ea3 t\u00e1o trong th\u00f9ng A v\u00e0 82 qu\u1ea3 t\u00e1o trong th\u00f9ng B. H\u1ecfi ph\u1ea3i chuy\u1ec3n bao nhi\u00eau qu\u1ea3 t\u00e1o t\u1eeb th\u00f9ng A sang th\u00f9ng B \u0111\u1ec3 s\u1ed1 t\u00e1o trong th\u00f9ng B g\u1ea5p 4 l\u1ea7n s\u1ed1 t\u00e1o trong th\u00f9ng A B\u00e0i gi\u1ea3i 111","B\u00c0I GI\u1ea2I M\u1eb9 sinh con n\u0103m 26 tu\u1ed5i v\u1eady m\u1eb9 h\u01a1n con 26 tu\u1ed5i. Do \u0111\u00f3 15 n\u0103m n\u1eefa m\u1eb9 c\u0169ng h\u01a1n con 26 tu\u1ed5i. Tu\u1ed5i c\u1ee7a con sau 15 n\u0103m n\u1eefa l\u00e0: 26 : (2 - 1) = 26 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a con hi\u1ec7n nay l\u00e0: 26 - 15 = 11 (tu\u1ed5i) Tu\u1ed5i c\u1ee7a m\u1eb9 hi\u1ec7n nay l\u00e0: 11 + 26 = 37 (tu\u1ed5i) \u0110\u00e1p s\u1ed1: M\u1eb9: 37 tu\u1ed5i, con: 11 tu\u1ed5i. B\u00e0i to\u00e1n t\u1ed5ng b\u1ed9i V\u00ed d\u1ee5: C\u00f3 73 qu\u1ea3 t\u00e1o trong th\u00f9ng A v\u00e0 82 qu\u1ea3 t\u00e1o trong th\u00f9ng B. H\u1ecfi ph\u1ea3i chuy\u1ec3n bao nhi\u00eau qu\u1ea3 t\u00e1o t\u1eeb th\u00f9ng A sang th\u00f9ng B \u0111\u1ec3 s\u1ed1 t\u00e1o trong th\u00f9ng B g\u1ea5p 4 l\u1ea7n s\u1ed1 t\u00e1o trong th\u00f9ng A B\u00e0i gi\u1ea3i 112","B\u00e0i to\u00e1n t\u1ed5ng hi\u1ec7u m\u1edf r\u1ed9ng V\u00ed d\u1ee5: C\u00f3 t\u1ed5ng c\u1ed9ng 95 qu\u1ea3 b\u00f3ng r\u1ed5, b\u00f3ng chuy\u1ec1n v\u00e0 b\u00f3ng \u0111\u00e1 trong ph\u00f2ng th\u1ec3 d\u1ee5c. S\u1ed1 b\u00f3ng chuy\u1ec1n g\u1ea5p \u0111\u00f4i s\u1ed1 b\u00f3ng r\u1ed5. S\u1ed1 b\u00f3ng \u0111\u00e1 \u00edt h\u01a1n s\u1ed1 b\u00f3ng chuy\u1ec1n l\u00e0 5 qu\u1ea3. H\u1ecfi c\u00f3 bao nhi\u00eau b\u00f3ng r\u1ed5 v\u00e0 b\u00f3ng chuy\u1ec1n \u1edf trong ph\u00f2ng? B\u00e0i gi\u1ea3i 113","Gi\u1ea3i to\u00e1n b\u1eb1ng so s\u00e1nh v\u00e0 thay th\u1ebf - D\u1ea1ng 1: Qu\u1ea3 c\u00e2n V\u00ed d\u1ee5: Hai qu\u1ea3 d\u01b0a h\u1ea5u v\u00e0 ba qu\u1ea3 d\u01b0a gang c\u00f3 gi\u00e1 48$. M\u1ed7i qu\u1ea3 d\u01b0a gang c\u00f3 gi\u00e1 g\u1ea5p \u0111\u00f4i qu\u1ea3 d\u01b0a h\u1ea5u. H\u1ecfi m\u1ed7i qu\u1ea3 d\u01b0a h\u1ea5u c\u00f3 gi\u00e1 bao nhi\u00eau $? B\u00e0i gi\u1ea3i - D\u1ea1ng 2: H\u00ecnh th\u1ec3 V\u00ed d\u1ee5: 4 qu\u1ea3 t\u00e1o v\u00e0 3 qu\u1ea3 \u0111\u00e0o gi\u00e1 10$. 4 qu\u1ea3 t\u00e1o v\u00e0 6 qu\u1ea3 \u0111\u00e0o gi\u00e1 16$. H\u1ecfi m\u1ed7i qu\u1ea3 \u0111\u00e0o c\u00f3 gi\u00e1 bao nhi\u00eau $? 114","B\u00e0i gi\u1ea3i - D\u1ea1ng 3: L\u1eddi v\u0103n V\u00ed d\u1ee5: M\u1ed9t c\u00e1i r\u1ed5 ch\u1ee9a nh\u1eefng qu\u1ea3 b\u00f3ng m\u00e0u v\u00e0ng, \u0111\u1ecf v\u00e0 \u0111en. C\u00f3 15 qu\u1ea3 b\u00f3ng m\u00e0u \u0111\u1ecf v\u00e0 m\u00e0u v\u00e0ng. C\u00f3 18 qu\u1ea3 b\u00f3ng m\u00e0u \u0111\u1ecf v\u00e0 \u0111en. S\u1ed1 b\u00f3ng m\u00e0u \u0111en v\u00e0 v\u00e0ng l\u00e0 9. T\u00ecm s\u1ed1 b\u00f3ng c\u1ee7a m\u1ed7i m\u00e0u? B\u00e0i gi\u1ea3i 115","B\u00e0i to\u00e1n th\u1eeba v\u00e0 thi\u1ebfu S\u1eed d\u1ee5ng d\u1eef ki\u1ec7n \\\"th\u1eeba\\\", \\\"thi\u1ebfu\\\" c\u1ee7a b\u00e0i to\u00e1n \u0111\u1ec3 t\u00ecm m\u1ed1i li\u00ean h\u1ec7 c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng trong b\u00e0i to\u00e1n. V\u00e0 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 h\u00ecnh v\u1ebd \u0111\u1ec3 bi\u1ec3u di\u1ec5n v\u00e0 \u0111\u01b0a v\u1ec1 c\u00e1c d\u1ea1ng to\u00e1n quen thu\u1ed9c \u0111\u1ec3 gi\u1ea3i b\u00e0i to\u00e1n. V\u00ed d\u1ee5: Trong m\u1ed9t d\u1ef1 \u00e1n tr\u1ed3ng c\u00e2y, m\u1ed7i t\u00ecnh nguy\u1ec7n vi\u00ean tr\u1ed3ng s\u1ed1 c\u00e2y nh\u01b0 nhau. N\u1ebfu m\u1ed7i ng\u01b0\u1eddi tr\u1ed3ng 5 c\u00e2y, th\u00ec s\u1ebd c\u00f2n l\u1ea1i 3 c\u00e2y. N\u1ebfu m\u1ed7i ng\u01b0\u1eddi tr\u1ed3ng 3 c\u00e2y, th\u00ec s\u1ebd c\u00f2n l\u1ea1i 9 c\u00e2y. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y c\u1ea7n \u0111\u01b0\u1ee3c tr\u1ed3ng? Bao nhi\u00eau t\u00ecnh nguy\u1ec7n vi\u00ean? B\u00e0i gi\u1ea3i L\u00fac \u0111\u1ea7u, ph\u1ea7n th\u1eeba l\u00e0 3 c\u00e2y. L\u00fac sau, ph\u1ea7n th\u1eeba l\u00e0 9 c\u00e2y. Hi\u1ec7u s\u1ed1 c\u00e2y gi\u1eefa 2 l\u1ea7n l\u00e0: 5 - 3 = 2 (c\u00e2y) S\u1ed1 t\u00ecnh nguy\u1ec7n vi\u00ean l\u00e0: (9 - 3): 2 = 3 (ng\u01b0\u1eddi) S\u1ed1 c\u00e2y c\u1ea7n tr\u1ed3ng l\u00e0: 3 x 5 + 3 = 3 x 3 + 9 = 18 (c\u00e2y) \u0110\u00e1p s\u1ed1: 18 c\u00e2y 116","LUY\u1ec6N T\u1eacP C\u00e2u 1. N\u0103m nay anh 18 tu\u1ed5i v\u00e0 em 6 tu\u1ed5i. H\u1ecfi c\u00e1ch \u0111\u00e2y m\u1ea5y n\u0103m th\u00ec tu\u1ed5i anh g\u1ea5p 4 l\u1ea7n tu\u1ed5i em? A BC D C\u00e2u 2. Nh\u00e0 B\u00e1c An tr\u1ed3ng 42 c\u00e2y t\u00e1o v\u00e0 xo\u00e0i. S\u1ed1 c\u00e2y t\u00e1o \u00edt h\u01a1n s\u1ed1 c\u00e2y xo\u00e0i l\u00e0 6 c\u00e2y. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y t\u00e1o v\u00e0 bao nhi\u00eau c\u00e2y xo\u00e0i? C\u00e2u 3. L\u1edbp 4C c\u00f3 t\u1ed5ng c\u1ed9ng 28 h\u1ecdc sinh, s\u1ed1 h\u1ecdc sinh n\u1eef \u00edt h\u01a1n s\u1ed1 h\u1ecdc sinh nam 10 h\u1ecdc sinh. H\u1ecfi l\u1edbp 4C c\u00f3 bao nhi\u00eau h\u1ecdc sinh n\u1eef, bao nhi\u00eau h\u1ecdc sinh nam? 117","C\u00e2u 4. Trong m\u1ed9t trang tr\u1ea1i c\u00f3 t\u1ea5t c\u1ea3 240 con g\u00e0 v\u00e0 v\u1ecbt. S\u1ed1 g\u00e0 \u00edt h\u01a1n s\u1ed1 v\u1ecbt 80 con. H\u1ecfi c\u00f3 bao nhi\u00eau con g\u00e0 v\u00e0 bao nhi\u00eau con v\u1ecbt? C\u00e2u 5. Mary c\u00f3 nhi\u1ec1u h\u01a1n Betty 7$. Betty c\u00f3 nhi\u1ec1u h\u01a1n Anan 9$. T\u1ed5ng s\u1ed1 ti\u1ec1n ba b\u1ea1n c\u00f3 l\u00e0 97$. H\u1ecfi m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau ti\u1ec1n? C\u00e2u 6. Minh c\u00f3 \u00edt h\u01a1n B\u00ecnh 6 vi\u00ean bi, B\u00ecnh c\u00f3 \u00edt h\u01a1n Nam 7 vi\u00ean bi. T\u1ed5ng s\u1ed1 bi c\u1ee7a c\u1ea3 ba b\u1ea1n l\u00e0 100 vi\u00ean bi. H\u1ecfi Nam c\u00f3 bao nhi\u00eau vi\u00ean bi? 118","C\u00e2u 7. B\u00ecnh A ch\u1ee9a nhi\u1ec1u h\u01a1n b\u00ecnh B 6 l\u00edt n\u01b0\u1edbc. B\u00ecnh B ch\u1ee9a nhi\u1ec1u h\u01a1n b\u00ecnh C 7 l\u00edt n\u01b0\u1edbc. T\u1ed5ng th\u1ec3 t\u00edch n\u01b0\u1edbc c\u1ee7a 3 b\u00ecnh l\u00e0 92 l\u00edt. H\u1ecfi b\u00ecnh A ch\u1ee9a \u0111\u01b0\u1ee3c bao nhi\u00eau l\u00edt n\u01b0\u1edbc? C\u00e2u 8. Minh v\u00e0 Nam c\u00f3 t\u1ea5t c\u1ea3 240 vi\u00ean bi. S\u1ed1 bi c\u1ee7a Minh g\u1ea5p 5 l\u1ea7n s\u1ed1 bi c\u1ee7a Nam. H\u1ecfi Minh c\u00f3 bao nhi\u00eau vi\u00ean bi? C\u00e2u 9. C\u00f3 48 vi\u00ean k\u1eb9o trong h\u1ed9p A v\u00e0 80 vi\u00ean k\u1eb9o trong h\u1ed9p B. H\u1ecfi ph\u1ea3i chuy\u1ec3n bao nhi\u00eau vi\u00ean k\u1eb9o t\u1eeb h\u1ed9p A sang h\u1ed9p B \u0111\u1ec3 s\u1ed1 vi\u00ean k\u1eb9o trong h\u1ed9p B g\u1ea5p 3 l\u1ea7n s\u1ed1 vi\u00ean k\u1eb9o trong h\u1ed9p A? 119","C\u00e2u 10. L\u00fac \u0111\u1ea7u Jack v\u00e0 Mary c\u00f3 s\u1ed1 ti\u1ec1n b\u1eb1ng nhau. Sau khi Jack ti\u00eau 24$ v\u00e0 Mary ti\u00eau 148$ th\u00ec s\u1ed1 ti\u1ec1n c\u1ee7a Jack g\u1ea5p 5 l\u1ea7n s\u1ed1 ti\u1ec1n c\u1ee7a Mary. H\u1ecfi l\u00fac \u0111\u1ea7u m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau ti\u1ec1n? C\u00e2u 11. C\u00f3 ba \u0111o\u1ea1n d\u00e2y. \u0110o\u1ea1n d\u00e2y th\u1ee9 nh\u1ea5t ng\u1eafn h\u01a1n \u0111o\u1ea1n th\u1ee9 hai 9m. \u0110o\u1ea1n th\u1ee9 hai ng\u1eafn h\u01a1n \u0111o\u1ea1n th\u1ee9 ba 7m. Bi\u1ebft r\u1eb1ng t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea3 ba \u0111o\u1ea1n l\u00e0 97m, t\u00ecm chi\u1ec1u d\u00e0i \u0111o\u1ea1n d\u00e2y th\u1ee9 nh\u1ea5t. C\u00e2u 12. Mary, Anan v\u00e0 Jack c\u00f3 t\u1ed5ng c\u1ed9ng 240$. N\u1ebfu Mary \u0111\u01b0a cho Anan 8$ v\u00e0 Jack \u0111\u01b0a cho Anan 24$ th\u00ec ba b\u1ea1n c\u00f3 s\u1ed1 ti\u1ec1n b\u1eb1ng nhau. H\u1ecfi l\u00fac \u0111\u1ea7u m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau ti\u1ec1n? 120","C\u00e2u 13. Trong v\u01b0\u1eddn nh\u00e0 b\u00e1c Lan c\u00f3 s\u1ed1 c\u00e2y t\u00e1o nhi\u1ec1u h\u01a1n s\u1ed1 c\u00e2y cam l\u00e0 30 c\u00e2y, s\u1ed1 c\u00e2y cam nhi\u1ec1u h\u01a1n s\u1ed1 c\u00e2y xo\u00e0i l\u00e0 24 c\u00e2y. C\u1ea3 v\u01b0\u1eddn nh\u00e0 b\u00e1c Lan c\u00f3 t\u1ea5t c\u1ea3 342 c\u00e2y. H\u1ecfi v\u01b0\u1eddn nh\u00e0 b\u00e1c Lan c\u00f3 bao nhi\u00eau c\u00e2y t\u00e1o? C\u00e2u 14. Khu v\u01b0\u1eddn nh\u00e0 b\u00e1c Minh tr\u1ed3ng 24 c\u00e2y chanh v\u00e0 cam, bi\u1ebft s\u1ed1 c\u00e2y chanh \u00edt h\u01a1n s\u1ed1 c\u00e2y cam 8 c\u00e2y. H\u1ecfi c\u00f3 trong v\u01b0\u1eddn c\u00f3 bao nhi\u00eau c\u00e2y cam, c\u00f3 bao nhi\u00eau c\u00e2y chanh? C\u00e2u 15. C\u00f3 73 h\u1ecdc sinh trong hai l\u1edbp 4A v\u00e0 4B. C\u00f3 81 h\u1ecdc sinh trong hai l\u1edbp 4B v\u00e0 4C. C\u00f3 74 h\u1ecdc sinh trong hai l\u1edbp 4A v\u00e0 4C. H\u1ecfi l\u1edbp 4B c\u00f3 bao nhi\u00eau h\u1ecdc sinh? 121","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 16. M\u1ed9t c\u00e1i r\u1ed5 ch\u1ee9a nh\u1eefng qu\u1ea3 b\u00f3ng m\u00e0u v\u00e0ng, \u0111\u1ecf v\u00e0 \u0111en. C\u00f3 18 qu\u1ea3 b\u00f3ng m\u00e0u \u0111\u1ecf v\u00e0 m\u00e0u v\u00e0ng. C\u00f3 24 qu\u1ea3 b\u00f3ng m\u00e0u \u0111\u1ecf v\u00e0 \u0111en. S\u1ed1 b\u00f3ng m\u00e0u \u0111en v\u00e0 v\u00e0ng l\u00e0 30. T\u00ecm s\u1ed1 b\u00f3ng c\u1ee7a m\u00e0u \u0111\u1ecf? C\u00e2u 17. C\u00f4 gi\u00e1o \u0111i c\u1eeda h\u00e0ng \u0111\u1ec3 mua m\u1ed9t s\u1ed1 d\u1ee5ng c\u1ee5 h\u1ecdc t\u1eadp cho h\u1ecdc sinh, bao g\u1ed3m b\u00fat ch\u00ec, c\u1ee5c g\u00f4m, b\u00fat m\u1ef1c. C\u00f3 32 b\u00fat bi v\u00e0 b\u00fat m\u1ef1c, 37 b\u00fat ch\u00ec v\u00e0 c\u1ee5c g\u00f4m, 31 b\u00fat m\u1ef1c v\u00e0 c\u1ee5c g\u00f4m. H\u1ecfi c\u00f4 \u1ea5y \u0111\u00e3 mua bao nhi\u00eau c\u1ee5c g\u00f4m? 122","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 18. C\u00f3 66 ng\u01b0\u1eddi l\u1edbn v\u00e0 nh\u1eefng b\u00e9 trai, 84 ng\u01b0\u1eddi l\u1edbn v\u00e0 nh\u1eefng b\u00e9 g\u00e1i, 70 b\u00e9 g\u00e1i v\u00e0 b\u00e9 trai trong m\u1ed9t b\u1eefa ti\u1ec7c. H\u00e3y t\u00ecm s\u1ed1 ng\u01b0\u1eddi l\u1edbn trong b\u1eefa ti\u1ec7c \u0111\u00f3. C\u00e2u 19. 2 cu\u1ed1n s\u00e1ch v\u00e0 2 h\u1ed9p b\u00fat ch\u00ec c\u00f3 gi\u00e1 32$. 2 cu\u1ed1n s\u00e1ch \u0111\u00f3 v\u00e0 6 h\u1ed9p b\u00fat ch\u00ec c\u00f3 gi\u00e1 60$. H\u1ecfi m\u1ed7i h\u1ed9p b\u00fat ch\u00ec c\u00f3 gi\u00e1 bao nhi\u00eau $? C\u00e2u 20. 3 qu\u1ea3 t\u00e1o v\u00e0 4 qu\u1ea3 \u0111\u00e0o gi\u00e1 21$. 3 qu\u1ea3 t\u00e1o v\u00e0 7 qu\u1ea3 \u0111\u00e0o gi\u00e1 30$. H\u1ecfi m\u1ed7i qu\u1ea3 \u0111\u00e0o c\u00f3 gi\u00e1 bao nhi\u00eau $? 123","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 21. 3 qu\u1ea3 chanh v\u00e0 3 qu\u1ea3 d\u01b0a c\u00f3 gi\u00e1 12$. 3 qu\u1ea3 chanh v\u00e0 5 qu\u1ea3 d\u01b0a c\u00f3 gi\u00e1 16$. H\u1ecfi m\u1ed7i qu\u1ea3 chanh c\u00f3 gi\u00e1 bao nhi\u00eau $? C\u00e2u 22. 6 chi\u1ebfc b\u00ecnh v\u00e0 5 chi\u1ebfc c\u1ed1c c\u00f3 gi\u00e1 90$. 3 chi\u1ebfc b\u00ecnh v\u00e0 2 chi\u1ebfc c\u1ed1c c\u00f3 gi\u00e1 42$. H\u1ecfi gi\u00e1 c\u1ee7a m\u1ed9t chi\u1ebfc c\u1ed1c l\u00e0 bao nhi\u00eau? C\u00e2u 23. 4 qu\u1ea3 d\u01b0a h\u1ea5u v\u00e0 7 qu\u1ea3 th\u01a1m c\u00f3 gi\u00e1 91$. 2 qu\u1ea3 d\u01b0a h\u1ea5u v\u00e0 2 qu\u1ea3 th\u01a1m c\u00f3 gi\u00e1 32$. H\u1ecfi m\u1ed7i qu\u1ea3 th\u01a1m c\u00f3 gi\u00e1 bao nhi\u00eau $? 124","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 24. Hai qu\u1ea3 d\u01b0a h\u1ea5u v\u00e0 b\u1ed1n qu\u1ea3 d\u01b0a gang c\u00f3 gi\u00e1 50$. M\u1ed7i qu\u1ea3 d\u01b0a gang c\u00f3 gi\u00e1 g\u1ea5p hai l\u1ea7n qu\u1ea3 d\u01b0a h\u1ea5u. H\u1ecfi m\u1ed7i qu\u1ea3 d\u01b0a h\u1ea5u c\u00f3 gi\u00e1 bao nhi\u00eau $? C\u00e2u 25. M\u1eb9 mua 2 chi\u1ebfc qu\u1ea7n v\u00e0 1 chi\u1ebfc \u00e1o c\u00f3 gi\u00e1 120$. M\u1ed7i chi\u1ebfc \u00e1o c\u00f3 gi\u00e1 g\u1ea5p \u0111\u00f4i chi\u1ebfc qu\u1ea7n. H\u1ecfi m\u1ed7i chi\u1ebfc qu\u1ea7n c\u00f3 gi\u00e1 bao nhi\u00eau? C\u00e2u 26. B\u1ed1 m\u1eb9 mua 1 chi\u1ebfc b\u00e0n v\u00e0 6 chi\u1ebfc gh\u1ebf v\u1edbi gi\u00e1 l\u00e0 300$. M\u1ed7i chi\u1ebfc b\u00e0n c\u00f3 gi\u00e1 g\u1ea5p 4 l\u1ea7n 1 chi\u1ebfc gh\u1ebf. H\u1ecfi m\u1ed7i chi\u1ebfc b\u00e0n c\u00f3 gi\u00e1 bao nhi\u00eau? 125","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 27. Lan mua 2 c\u00e2y b\u00fat v\u00e0 3 c\u00e2y th\u01b0\u1edbc c\u00f3 gi\u00e1 l\u00e0 16$. M\u1ed7i c\u00e2y th\u01b0\u1edbc c\u00f3 gi\u00e1 g\u1ea5p \u0111\u00f4i 1 c\u00e2y b\u00fat. H\u1ecfi m\u1ed7i c\u00e2y b\u00fat c\u00f3 gi\u00e1 bao nhi\u00eau $? C\u00e2u 28. \u00d4ng Cohen mua 2 c\u00e1i n\u1ed3i v\u00e0 5 c\u00e1i ch\u1ea3o h\u1ebft 360$. Gi\u00e1 c\u1ee7a m\u1ed9t c\u00e1i n\u1ed3i b\u1eb1ng t\u1ed5ng gi\u00e1 c\u1ee7a 5 c\u00e1i ch\u1ea3o. H\u1ecfi gi\u00e1 c\u1ee7a m\u1ed9t c\u00e1i ch\u1ea3o l\u00e0 bao nhi\u00eau $? C\u00e2u 29. B\u1ed1 ch\u1edf Jack \u0111i h\u1ecdc v\u1edbi v\u1eadn t\u1ed1c 70km\/gi\u1edd. H\u1ecfi b\u1ed1 Jack \u0111i trong bao l\u00e2u bi\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng t\u1eeb nh\u00e0 \u0111\u1ebfn tr\u01b0\u1eddng l\u00e0 7km? 126","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 30. Jack n\u0103m nay 10 tu\u1ed5i, Jack h\u1ecfi anh bao nhi\u00eau tu\u1ed5i th\u00ec anh tr\u1ea3 l\u1eddi r\u1eb1ng: \u201cKhi em b\u1eb1ng tu\u1ed5i anh b\u00e2y gi\u1edd th\u00ec anh 28 tu\u1ed5i\u201d. H\u1ecfi n\u0103m nay anh Jack bao nhi\u00eau tu\u1ed5i? C\u00e2u 31. Ch\u1ecdn s\u01a1 \u0111\u1ed3 th\u00edch h\u1ee3p cho b\u00e0i to\u00e1n: S\u1ed1 \u1edf ph\u00eda b\u00ean tr\u00e1i m\u0169i t\u00ean nh\u00e2n v\u1edbi 4 c\u1ed9ng th\u00eam 5 s\u1ebd \u0111\u01b0\u1ee3c s\u1ed1 \u1edf ph\u00eda b\u00ean ph\u1ea3i. 127","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 32. N\u0103m nay Mary 7 tu\u1ed5i, khi Mary b\u1eb1ng tu\u1ed5i m\u1eb9 b\u00e2y gi\u1edd th\u00ec m\u1eb9 55 tu\u1ed5i. H\u1ecfi n\u0103m nay m\u1eb9 Mary bao nhi\u00eau tu\u1ed5i? C\u00e2u 33. N\u0103m nay Anan 9 tu\u1ed5i, khi Anan b\u1eb1ng tu\u1ed5i c\u1ee7a b\u1ed1 b\u00e2y gi\u1edd th\u00ec b\u1ed1 s\u1ebd l\u00e0 61 tu\u1ed5i. H\u1ecfi n\u0103m nay b\u1ed1 Anan bao nhi\u00eau tu\u1ed5i? C\u00e2u 34. Lan 12 tu\u1ed5i, b\u1ea1n \u1ea5y \u0111\u00e3 h\u1ecfi d\u00ec bao nhi\u00eau tu\u1ed5i, th\u00ec d\u00ec tr\u1ea3 l\u1eddi l\u00e0: \u201cKhi con b\u1eb1ng tu\u1ed5i c\u1ee7a d\u00ec b\u00e2y gi\u1edd, th\u00ec d\u00ec s\u1ebd l\u00e0 62 tu\u1ed5i\u201d. H\u1ecfi n\u0103m nay d\u00ec bao nhi\u00eau tu\u1ed5i? 128","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 35. N\u0103m nay Linh 10 tu\u1ed5i, khi tu\u1ed5i Linh b\u1eb1ng tu\u1ed5i m\u1eb9 b\u00e2y gi\u1edd th\u00ec m\u1eb9 s\u1ebd l\u00e0 66 tu\u1ed5i. H\u1ecfi n\u0103m nay m\u1eb9 Linh bao nhi\u00eau tu\u1ed5i? C\u00e2u 36. T\u1ed5ng tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 b\u00e9 l\u00e0 37 tu\u1ed5i. C\u00e1ch \u0111\u00e2y 2 n\u0103m, tu\u1ed5i b\u00e9 k\u00e9m tu\u1ed5i m\u1eb9 27 tu\u1ed5i. H\u1ecfi hi\u1ec7n nay m\u1ed7i ng\u01b0\u1eddi bao nhi\u00eau tu\u1ed5i? C\u00e2u 37. Hi\u1ec7n nay ch\u1ecb c\u1ee7a Lan 12 tu\u1ed5i, Lan 8 tu\u1ed5i. H\u1ecfi c\u00e1ch \u0111\u00e2y m\u1ea5y n\u0103m tu\u1ed5i ch\u1ecb g\u1ea5p \u0111\u00f4i tu\u1ed5i c\u1ee7a Lan? 129","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 38. C\u00e1c gi\u00e1o vi\u00ean \u0111\u01b0a h\u1ecdc sinh \u0111i d\u00e3 ngo\u1ea1i b\u1eb1ng thuy\u1ec1n. N\u1ebfu m\u1ed7i thuy\u1ec1n c\u00f3 th\u1ec3 ch\u1edf 6 h\u1ecdc sinh th\u00ec 6 h\u1ecdc sinh kh\u00f4ng th\u1ec3 tham gia. N\u1ebfu m\u1ed7i thuy\u1ec1n c\u00f3 th\u1ec3 ch\u1edf 7 h\u1ecdc sinh th\u00ec v\u1eeba \u0111\u1ee7 s\u1ed1 thuy\u1ec1n. H\u1ecfi c\u00f3 bao nhi\u00eau thuy\u1ec1n? C\u00e2u 39. M\u1ed9t ng\u01b0\u1eddi \u0111i xe \u0111\u1ea1p t\u1edbi ch\u1ed7 l\u00e0m, n\u1ebfu \u0111i v\u1edbi v\u1eadn t\u1ed1c 120m\/ph\u00fat th\u00ec ng\u01b0\u1eddi \u0111\u00f3 \u0111\u1ebfn ch\u1ed7 l\u00e0m tr\u1ec5 3 ph\u00fat. N\u1ebfu \u0111i v\u1edbi v\u1eadn t\u1ed1c 180m\/ph\u00fat th\u00ec ng\u01b0\u1eddi \u0111\u00f3 t\u1edbi ch\u1ed7 l\u00e0m s\u1edbm 2 ph\u00fat. H\u1ecfi th\u1eddi gian d\u1ef1 ki\u1ebfn \u0111i c\u1ee7a ng\u01b0\u1eddi \u1ea5y l\u00e0 bao nhi\u00eau ph\u00fat? C\u00e2u 40. \u0110\u1ec3 ch\u1edf h\u1ebft g\u1ea1o trong kho c\u1ea7n m\u1ed9t s\u1ed1 ng\u00e0y. N\u1ebfu m\u1ed9t ng\u00e0y ch\u1edf \u0111\u01b0\u1ee3c 40 t\u1ea5n g\u1ea1o th\u00ec ho\u00e0n th\u00e0nh xong k\u1ebf ho\u1ea1ch tr\u1ec5 h\u01a1n 1 ng\u00e0y. N\u1ebfu m\u1ed9t ng\u00e0y \u0111\u01b0\u1ee3c 60 t\u1ea5n g\u1ea1o th\u00ec ho\u00e0n th\u00e0nh xong k\u1ebf ho\u1ea1ch s\u1edbm h\u01a1n 1 ng\u00e0y. H\u1ecfi s\u1ed1 ng\u00e0y d\u1ef1 ki\u1ebfn \u0111\u1ec3 ch\u1edf h\u1ebft s\u1ed1 g\u1ea1o trong kho? A. 5 ng\u00e0y B. 6 ng\u00e0y C. 7 ng\u00e0y 130","\u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 7 1A 6A 11C 16B 21C 26C 31C 36B 2A 7C 12B 17C 22A 27B 32A 37C 3B 8B 13C 18A 23B 28A 33B 38A 4C 9B 14C 19A 24A 29A 34C 39D 5A 10A 15A 20B 25B 30C 35A 40A T\u1ea3i App Hoc247 Kids \u0111\u1ec3 xem video h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft nh\u00e9! 131"]