1001 toán tư duy lớp 2

["C\u00e2u 22: C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng trong h\u00ecnh sau? C\u00e2u 23: C\u00f3 bao nhi\u00eau h\u00ecnh tam gi\u00e1c trong h\u00ecnh sau? C\u00e2u 24: C\u00f3 bao nhi\u00eau kh\u1ed1i trong h\u00ecnh sau? C\u00e2u 25: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? App HOC247 Kids 101 kids.hoc247.vn","C\u00e2u 26: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 27: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 28: C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng trong h\u00ecnh sau? App HOC247 Kids 102 kids.hoc247.vn","C\u00e2u 29: B\u00e1c Mike, b\u00e1c Andy v\u00e0 b\u00e1c Andrew trong ba ng\u01b0\u1eddi c\u00f3 ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf, c\u00f3 ng\u01b0\u1eddi l\u00e0m b\u1ea3o v\u1ec7 v\u00e0 ng\u01b0\u1eddi c\u00f2n l\u1ea1i l\u00e0m h\u1ecda s\u0129. Bi\u1ebft r\u1eb1ng, b\u00e1c Mike kh\u00f4ng c\u00f9ng tu\u1ed5i v\u1edbi ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf, b\u00e1c Andrew l\u1ea1i kh\u00f4ng b\u1eb1ng tu\u1ed5i v\u1edbi ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf v\u00e0 h\u1ecda s\u0129. V\u1eady b\u00e1c Andy l\u00e0m ngh\u1ec1 g\u00ec? C\u00e2u 30: 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? C\u00e2u 31: 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. App HOC247 Kids 103 kids.hoc247.vn","C\u00e2u 32: Jack, Andy v\u00e0 Mary m\u1ed7i ng\u01b0\u1eddi l\u00e0 ch\u1ee7 nh\u00e2n c\u1ee7a m\u1ed9t con v\u1eadt, n\u00e0o c\u00f3 ch\u00f3, m\u00e8o v\u00e0 th\u1ecf. Bi\u1ebft r\u1eb1ng, Mary kh\u00f4ng th\u00edch nu\u00f4i th\u1ecf, Andy l\u1ea1i kh\u00f4ng th\u00edch nu\u00f4i ch\u00f3 v\u00e0 th\u1ecf. X\u00e1c \u0111\u1ecbnh con v\u1eadt nu\u00f4i c\u1ee7a m\u1ed7i b\u1ea1n. C\u00e2u 33: T\u00e1o, cam v\u00e0 l\u00ea l\u00e0 c\u00e1c lo\u1ea1i qu\u1ea3 \u01b0a th\u00edch c\u1ee7a ba b\u1ea1n Anan, LyLy v\u00e0 MyMy, m\u1ed7i b\u1ea1n th\u00edch m\u1ed9t lo\u1ea1i qu\u1ea3 kh\u00e1c nhau. Bi\u1ebft r\u1eb1ng, Anan kh\u00f4ng th\u00edch \u0103n l\u00ea, LyLy kh\u00f4ng th\u00edch \u0103n l\u00ea v\u00e0 t\u00e1o. H\u1ecfi ai l\u00e0 ng\u01b0\u1eddi th\u00edch \u0103n t\u00e1o? C\u00e2u 34: M\u1ed9t m\u1ed9t cu\u1ed9c thi ch\u1ea1y gi\u1eefa ba b\u1ea1n H\u00f9ng, Lan v\u00e0 Hu\u1ec7 \u0111\u00e3 v\u1ec1 \u0111\u00edch v\u1edbi nh\u1eefng v\u1ecb tr\u00ed nh\u01b0 sau: H\u00f9ng kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi v\u1ec1 \u0111\u00edch cu\u1ed1i c\u00f9ng, Hu\u1ec7 v\u1ec1 sau H\u00f9ng nh\u01b0ng c\u0169ng kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi v\u1ec1 \u0111\u00edch cu\u1ed1i c\u00f9ng. H\u1ecfi b\u1ea1n n\u00e0o \u0111\u00e3 v\u1ec1 \u0111\u00edch \u0111\u1ea7u ti\u00ean? App HOC247 Kids 104 kids.hoc247.vn","\u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 6 C\u00e2u 1: Ch\u1ecdn c\u00e1ch chia \u0111\u1ec1u 6 qu\u1ea3 cherry cho 2 b\u1ea1n: C\u00e2u 2: Ch\u1ecdn ph\u00e9p t\u00ednh \u0111\u00fang: 10 qu\u1ea3 t\u00e1o chia th\u00e0nh 5 ph\u1ea7n b\u1eb1ng nhau? C\u00e2u 3: 8 c\u00e1i b\u00e1nh chia \u0111\u1ec1u cho 3 b\u1ea1n th\u00ec c\u00f2n d\u01b0 l\u1ea1i bao nhi\u00eau c\u00e1i b\u00e1nh? App HOC247 Kids 105 kids.hoc247.vn","C\u00e2u 4: 19 c\u00e1i b\u00e1nh chia \u0111\u1ec1u cho 5 \u0111\u0129a. H\u1ecfi c\u00f2n d\u01b0 l\u1ea1i bao nhi\u00eau c\u00e1i b\u00e1nh? C\u00e2u 5: V\u00e0o m\u1ed9t n\u0103m n\u00e0o \u0111\u00f3, ng\u00e0y 1 th\u00e1ng T\u01b0 l\u00e0 ng\u00e0y Ch\u1ee7 nh\u1eadt. H\u1ecfi ng\u00e0y 25 th\u00e1ng T\u01b0 c\u00f9ng n\u0103m l\u00e0 th\u1ee9 m\u1ea5y trong tu\u1ea7n? C\u00e2u 6: Ch\u1ecdn ph\u00e9p t\u00ednh \u0111\u00fang: 12 c\u00e1i b\u00e1nh chia \u0111\u1ec1u cho 6 b\u1ea1n. M\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau c\u00e1i b\u00e1nh? C\u00e2u 7: Ch\u1eadu hoa \u0111\u1ea7u ti\u00ean l\u00e0 hoa tulip v\u00e0ng, k\u1ebf ti\u1ebfp l\u00e0 ch\u1eadu hoa tulip \u0111\u1ecf. Ch\u1eadu hoa tulip v\u00e0ng v\u00e0 ch\u1eadu tulip \u0111\u1ecf \u0111\u1eb7t xen k\u1ebd nhau. H\u1ecfi ch\u1eadu hoa th\u1ee9 11 l\u00e0 ch\u1eadu hoa m\u00e0u g\u00ec? App HOC247 Kids 106 kids.hoc247.vn","C\u00e2u 8: Nh\u00e0 b\u00e1c Lan c\u00f3 nu\u00f4i s\u1ed1 b\u00f2 v\u00e0 s\u1ed1 tr\u00e2u b\u1eb1ng nhau. B\u00e1c \u0111\u1ebfm \u0111\u01b0\u1ee3c s\u1ed1 t\u1ea5t c\u1ea3 48 c\u00e1i ch\u00e2n. H\u1ecfi c\u00f3 m\u1ea5y con b\u00f2 v\u00e0 m\u1ea5y con tr\u00e2u? C\u00e2u 9: Lan r\u1ea5t th\u00edch \u0111\u1ed9ng v\u1eadt, \u1edf nh\u00e0 Lan c\u00f3 r\u1ea5t nhi\u1ec1u m\u00e8o v\u00e0 ch\u00f3. Bi\u1ebft r\u1eb1ng t\u1ed5ng s\u1ed1 ch\u00e2n m\u00e8o v\u00e0 ch\u00f3 \u1edf nh\u00e0 Lan l\u00e0 24 ch\u00e2n, v\u00e0 s\u1ed1 m\u00e8o b\u1eb1ng s\u1ed1 ch\u00f3. H\u1ecfi nh\u00e0 Lan nu\u00f4i bao nhi\u00eau con ch\u00f3 v\u00e0 bao nhi\u00eau con m\u00e8o? C\u00e2u 10: M\u1eb9 \u0111i ch\u1ee3 mua cho Anan m\u1ed9t s\u1ed1 \u00e1o qu\u1ea7n \u0111\u1ec3 v\u00e0o n\u0103m h\u1ecdc m\u1edbi, bi\u1ebft 1 c\u00e1i \u00e1o c\u00f3 gi\u00e1 l\u00e0 7$ v\u00e0 1 c\u00e1i qu\u1ea7n c\u00f3 gi\u00e1 l\u00e0 9$. M\u1eb9 mua t\u1ea5t c\u1ea3 4 \u00e1o v\u00e0 qu\u1ea7n. Bi\u1ebft m\u1eb9 ph\u1ea3i tr\u1ea3 32$ cho c\u1ea3 \u00e1o v\u00e0 qu\u1ea7n. H\u1ecfi m\u1eb9 mua bao nhi\u00eau c\u00e1i \u00e1o v\u00e0 bao nhi\u00eau c\u00e1i qu\u1ea7n? App HOC247 Kids 107 kids.hoc247.vn","C\u00e2u 11: Ly Ly mua m\u1ed9t s\u1ed1 s\u1ed5 v\u00e0 b\u00fat ch\u00ec, m\u1ed9t c\u00e2y b\u00fat ch\u00ec c\u00f3 gi\u00e1 6$ v\u00e0 m\u1ed9t cu\u1ed1n s\u1ed5 c\u00f3 gi\u00e1 7$. Ly Ly ph\u1ea3i tr\u1ea3 h\u1ebft 40$ cho t\u1ea5t c\u1ea3 6 cu\u1ed1n s\u1ed5 v\u00e0 b\u00fat ch\u00ec. H\u1ecfi Ly Ly \u0111\u00e3 mua bao nhi\u00eau cu\u1ed1n s\u1ed5 v\u00e0 bao nhi\u00eau c\u00e2y b\u00fat ch\u00ec? C\u00e2u 12: M\u1ed9t chi\u1ebfc xe \u0111\u1ea1p c\u00f3 3 b\u00e1nh, xe \u0111\u1ea1p b\u00ecnh th\u01b0\u1eddng c\u00f3 2 b\u00e1nh, 10 xe c\u00f3 t\u1ea5t c\u1ea3 24 b\u00e1nh xe. H\u1ecfi c\u00f3 bao nhi\u00eau xe \u0111\u1ea1p 2 b\u00e1nh v\u00e0 bao nhi\u00eau xe \u0111\u1ea1p 3 b\u00e1nh? C\u00e2u 13: Trong b\u00e3i gi\u1eef xe, c\u00f3 10 xe c\u1ea3 xe \u00f4 t\u00f4 v\u00e0 xe m\u00e1y. Bi\u1ebft t\u1ed5ng c\u1ed9ng c\u00f3 30 b\u00e1nh xe. H\u1ecfi c\u00f3 bao nhi\u00eau xe \u00f4 t\u00f4, bao nhi\u00eau xe m\u00e1y? C\u00e2u 14: C\u00f3 t\u1ea5t c\u1ea3 4 con nh\u1ec7n v\u00e0 chu\u1ed3n chu\u1ed3n v\u1edbi t\u1ed5ng c\u1ed9ng 30 ch\u00e2n. T\u00ecm s\u1ed1 nh\u1ec7n v\u00e0 chu\u1ed3n chu\u1ed3n. App HOC247 Kids 108 kids.hoc247.vn","C\u00e2u 15: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong h\u00ecnh sau: C\u00e2u 16: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong d\u00e3y s\u1ed1 sau: 4; 8; 12; 16; 20; ... C\u00e2u 17: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong d\u00e3y s\u1ed1 sau: 2; 2; 4; 6; 10; 16; ... App HOC247 Kids 109 kids.hoc247.vn","C\u00e2u 18: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y: C\u00e2u 19: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y: C\u00e2u 20: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong d\u00e3y s\u1ed1 sau: C\u00e2u 21: T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y: App HOC247 Kids 110 kids.hoc247.vn","C\u00e2u 22: C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng trong h\u00ecnh sau? C\u00e2u 23: C\u00f3 bao nhi\u00eau h\u00ecnh tam gi\u00e1c trong h\u00ecnh sau? C\u00e2u 24: C\u00f3 bao nhi\u00eau kh\u1ed1i trong h\u00ecnh sau? C\u00e2u 25: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? App HOC247 Kids 111 kids.hoc247.vn","C\u00e2u 26: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 27: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 28: C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng trong h\u00ecnh sau? App HOC247 Kids 112 kids.hoc247.vn","C\u00e2u 29: B\u00e1c Mike, b\u00e1c Andy v\u00e0 b\u00e1c Andrew trong ba ng\u01b0\u1eddi c\u00f3 ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf, c\u00f3 ng\u01b0\u1eddi l\u00e0m b\u1ea3o v\u1ec7 v\u00e0 ng\u01b0\u1eddi c\u00f2n l\u1ea1i l\u00e0m h\u1ecda s\u0129. Bi\u1ebft r\u1eb1ng, b\u00e1c Mike kh\u00f4ng c\u00f9ng tu\u1ed5i v\u1edbi ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf, b\u00e1c Andrew l\u1ea1i kh\u00f4ng b\u1eb1ng tu\u1ed5i v\u1edbi ng\u01b0\u1eddi l\u00e0m t\u00e0i x\u1ebf v\u00e0 h\u1ecda s\u0129. V\u1eady b\u00e1c Andy l\u00e0m ngh\u1ec1 g\u00ec? C\u00e2u 30: 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? C\u00e2u 31: 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. App HOC247 Kids 113 kids.hoc247.vn","C\u00e2u 32: Jack, Andy v\u00e0 Mary m\u1ed7i ng\u01b0\u1eddi l\u00e0 ch\u1ee7 nh\u00e2n c\u1ee7a m\u1ed9t con v\u1eadt, n\u00e0o c\u00f3 ch\u00f3, m\u00e8o v\u00e0 th\u1ecf. Bi\u1ebft r\u1eb1ng, Mary kh\u00f4ng th\u00edch nu\u00f4i th\u1ecf, Andy l\u1ea1i kh\u00f4ng th\u00edch nu\u00f4i ch\u00f3 v\u00e0 th\u1ecf. X\u00e1c \u0111\u1ecbnh con v\u1eadt nu\u00f4i c\u1ee7a m\u1ed7i b\u1ea1n. C\u00e2u 33: T\u00e1o, cam v\u00e0 l\u00ea l\u00e0 c\u00e1c lo\u1ea1i qu\u1ea3 \u01b0a th\u00edch c\u1ee7a ba b\u1ea1n Anan, LyLy v\u00e0 MyMy, m\u1ed7i b\u1ea1n th\u00edch m\u1ed9t lo\u1ea1i qu\u1ea3 kh\u00e1c nhau. Bi\u1ebft r\u1eb1ng, Anan kh\u00f4ng th\u00edch \u0103n l\u00ea, LyLy kh\u00f4ng th\u00edch \u0103n l\u00ea v\u00e0 t\u00e1o. H\u1ecfi ai l\u00e0 ng\u01b0\u1eddi th\u00edch \u0103n t\u00e1o? C\u00e2u 34: M\u1ed9t m\u1ed9t cu\u1ed9c thi ch\u1ea1y gi\u1eefa ba b\u1ea1n H\u00f9ng, Lan v\u00e0 Hu\u1ec7 \u0111\u00e3 v\u1ec1 \u0111\u00edch v\u1edbi nh\u1eefng v\u1ecb tr\u00ed nh\u01b0 sau: H\u00f9ng kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi v\u1ec1 \u0111\u00edch cu\u1ed1i c\u00f9ng, Hu\u1ec7 v\u1ec1 sau H\u00f9ng nh\u01b0ng c\u0169ng kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi v\u1ec1 \u0111\u00edch cu\u1ed1i c\u00f9ng. H\u1ecfi b\u1ea1n n\u00e0o \u0111\u00e3 v\u1ec1 \u0111\u00edch \u0111\u1ea7u ti\u00ean? App HOC247 Kids 114 kids.hoc247.vn","1001 B\u00c0I TO\u00c1N T\u01af DUY Ch\u1ee7 \u0111\u1ec1 7: B\u1ea3ng. S\u01a1 \u0111\u1ed3. IQ I. Ki\u1ebfn th\u1ee9c tr\u1ecdng t\u00e2m 1. B\u00e0i to\u00e1n l\u1eadp danh s\u00e1ch, l\u1eadp b\u1ea3ng - D\u1ef1a v\u00e0o nh\u1eefng d\u1eef ki\u1ec7n \u0111\u1ec1 cho, ta li\u1ec7t k\u00ea ra t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 th\u1ec3 x\u1ea3y ra r\u1ed3i t\u1ed5ng h\u1ee3p ho\u1eb7c l\u1ef1a ch\u1ecdn c\u00e1c tr\u01b0\u1eddng h\u1ee3p th\u00edch h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee7a \u0111\u1ec1 b\u00e0i. \u00e0 V\u00ed d\u1ee5 1: Gi\u1ea3i \u00e0V\u00ed d\u1ee5 2: C\u00f3 bao nhi\u00eau s\u1ed1 chia h\u1ebft cho 5 trong kho\u1ea3ng t\u1eeb 8 \u0111\u1ebfn 24? Gi\u1ea3i Ta li\u1ec7t k\u00ea ra c\u00e1c s\u1ed1 t\u1eeb 8 \u0111\u1ebfn 24. Sau \u0111\u00f3 ch\u1ecdn ra c\u00e1c s\u1ed1 chia h\u1ebft cho 5, nh\u01b0 b\u1ea3ng sau: 115","1001 B\u00c0I TO\u00c1N T\u01af DUY 2. B\u00e0i to\u00e1n gi\u1ea3i b\u1eb1ng s\u01a1 \u0111\u1ed3. - V\u1ebd s\u01a1 \u0111\u1ed3, r\u1ed3i ph\u00e2n t\u00edch s\u01a1 \u0111\u1ed3 \u0111\u1ec3 t\u00ecm gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. \u00e0V\u00ed d\u1ee5: Anna v\u00e0 Mary c\u00f3 42$, Anna nhi\u1ec1u h\u01a1n Mary 10$. H\u1ecfi m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau $? Gi\u1ea3i - Theo \u0111\u1ec1 b\u00e0i ta c\u00f3: + Anna nhi\u1ec1u h\u01a1n Mary 10$\u00e0 V\u1eady trong s\u01a1 \u0111\u1ed3 Anna s\u1ebd l\u00e0 ph\u1ea7n d\u00e0i, Mary ph\u1ea7n ng\u1eafn v\u00e0 ph\u1ea7n d\u00e0i h\u01a1n l\u00e0 10$. + Anna v\u00e0 Mary c\u00f3 42$ \u00e0 T\u1ed5ng ti\u1ec1n c\u1ee7a Anna v\u00e0 Mary l\u00e0 42$ V\u1eady ta c\u00f3 s\u01a1 \u0111\u1ed3 nh\u01b0 sau: - Quan s\u00e1t v\u00e0o s\u01a1 \u0111\u1ed3 ta th\u1ea5y: 3. T\u00ednh t\u1ed5ng d\u00e3y s\u1ed1 c\u00f3 quy lu\u1eadt - B\u01b0\u1edbc 1: Nh\u00f3m th\u00e0nh c\u00e1c t\u1ed5ng b\u1eb1ng nhau. - B\u01b0\u1edbc 2: T\u00ednh s\u1ed1 l\u01b0\u1ee3ng c\u00e1c t\u1ed5ng b\u1eb1ng nhau - B\u01b0\u1edbc 3: Chuy\u1ec3n ph\u00e9p c\u1ed9ng v\u1ec1 d\u1ea1ng ph\u00e9p nh\u00e2n r\u1ed3i t\u00ednh. \u00e0V\u00ed d\u1ee5: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: 116","1001 B\u00c0I TO\u00c1N T\u01af DUY Gi\u1ea3i - Quan s\u00e1t v\u00e0o d\u00e3y s\u1ed1 ta th\u1ea5y: 7 + 19 = 26 9 + 17 = 26 11 + 15 = 26 - V\u1eady ta l\u00e0m nh\u01b0 sau: 4. T\u00ecm c\u00e1c s\u1ed1 h\u1ea1ng - B\u01b0\u1edbc 1: L\u1ea5y t\u1ed5ng chia cho s\u1ed1 s\u1ed1 h\u1ea1ng \u0111\u1ec3 t\u00ecm ra s\u1ed1 \u0111\u1ee9ng gi\u1eefa c\u00e1c s\u1ed1 h\u1ea1ng c\u1ea7n t\u00ecm. - B\u01b0\u1edbc 2: D\u1ef1a v\u00e0o y\u00eau c\u1ea7u c\u1ee7a \u0111\u1ec1 b\u00e0i \u0111\u1ec3 t\u00ecm ra c\u00e1c s\u1ed1 h\u1ea1ng. + N\u1ebfu l\u00e0 c\u00e1c s\u1ed1 li\u00ean ti\u1ebfp th\u00ec h\u01a1n k\u00e9m nhau 1 \u0111\u01a1n v\u1ecb + L\u00e0 c\u00e1c s\u1ed1 ch\u1eb5n (ho\u1eb7c s\u1ed1 l\u1ebb) li\u00ean ti\u1ebfp th\u00ec h\u01a1n k\u00e9m nhau 2 \u0111\u01a1n v\u1ecb. + T\u00ecm s\u1ed1 tr\u01b0\u1edbc \u0111\u00f3 th\u00ec tr\u1eeb, t\u00ecm s\u1ed1 sau \u0111\u00f3 th\u00ec c\u1ed9ng. \u00e0V\u00ed d\u1ee5: 117","1001 B\u00c0I TO\u00c1N T\u01af DUY Gi\u1ea3i - B\u01b0\u1edbc 1: L\u1ea5y t\u1ed5ng chia cho s\u1ed1 s\u1ed1 h\u1ea1ng \u0111\u1ec3 t\u00ecm ra s\u1ed1 \u0111\u1ee9ng gi\u1eefa c\u00e1c s\u1ed1 h\u1ea1ng c\u1ea7n t\u00ecm. \u00e0 V\u1eady 10 l\u00e0 s\u1ed1 \u1edf gi\u1eefa c\u00e1c s\u00e1c s\u1ed1 h\u1ea1ng c\u1ea7n t\u00ecm. - B\u01b0\u1edbc 2: V\u00ec 5 s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 5 s\u1ed1 li\u00ean ti\u1ebfp, do \u0111\u00f3 ta c\u00f3 kho\u1ea3ng c\u00e1ch gi\u1eefa hai s\u1ed1 li\u00ean ti\u1ebfp nhau l\u00e0 1. N\u00ean ta c\u00f3: \u00e0V\u1eady 5 s\u1ed1 \u0111\u00f3 l\u00e0 8, 9, 10, 11 v\u00e0 12. 118","B\u1ed9 c\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m C\u00e2u 1: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 2: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 3: C\u00f3 bao nhi\u00eau s\u1ed1 chia h\u1ebft cho 3 trong kho\u1ea3ng t\u1eeb 7 \u0111\u1ebfn 29? C\u00e2u 4: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 119 kids.hoc247.vn","C\u00e2u 5: Ba b\u1ea1n Jack, Andy v\u00e0 Mary \u0111ang x\u1ebfp th\u00e0nh m\u1ed9t h\u00e0ng d\u1ecdc. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e1ch s\u1eafp x\u1ebfp v\u1ecb tr\u00ed gi\u1eefa ba b\u1ea1n? C\u00e2u 6: Khi \u0111i si\u00eau th\u1ecb, Jack r\u1ea5t th\u00edch 3 m\u00f3n \u0111\u1ed3 ch\u01a1i, bao g\u1ed3m: xe \u0111\u1ed3 ch\u01a1i, si\u00eau nh\u00e2n v\u00e0 g\u1ea5u. Nh\u01b0ng m\u1eb9 ch\u1ec9 cho mua 2 trong 3 \u0111\u1ed3 ch\u01a1i tr\u00ean. H\u1ecfi Jack c\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 ch\u1ecdn 2 trong 3 \u0111\u1ed3 ch\u01a1i tr\u00ean? C\u00e2u 7: C\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 vi\u1ebft t\u1eeb STUDY t\u1eeb h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 8: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 120 kids.hoc247.vn","C\u00e2u 9: Trong v\u01b0\u1eddn c\u00f3 24 c\u00e2y t\u00e1o v\u00e0 xo\u00e0i. S\u1ed1 c\u00e2y t\u00e1o nhi\u1ec1u h\u01a1n s\u1ed1 c\u00e2y xo\u00e0i l\u00e0 6 c\u00e2y. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y t\u00e1o, bao nhi\u00eau c\u00e2y xo\u00e0i? C\u00e2u 10: T\u1ed5ng hai s\u1ed1 l\u00e0 32. Hai s\u1ed1 h\u01a1n k\u00e9m nhau 8 \u0111\u01a1n v\u1ecb. H\u00e3y t\u00ecm 2 s\u1ed1 \u0111\u00f3. C\u00e2u 11: Nh\u00e0 b\u00e1c Lan nu\u00f4i t\u1ea5t c\u1ea3 24 con g\u00e0 v\u00e0 v\u1ecbt. S\u1ed1 g\u00e0 g\u1ea5p 2 l\u1ea7n s\u1ed1 v\u1ecbt. H\u1ecfi nh\u00e0 b\u00e1c Lan nu\u00f4i bao nhi\u00eau con g\u00e0 v\u00e0 bao nhi\u00eau con v\u1ecbt? C\u00e2u 12: V\u01b0\u1eddn nh\u00e0 Anna c\u00f3 t\u1ea5t c\u1ea3 42 c\u00e2y cam v\u00e0 t\u00e1o, s\u1ed1 c\u00e2y cam g\u1ea5p 6 l\u1ea7n s\u1ed1 c\u00e2y t\u00e1o. H\u1ecfi nh\u00e0 Anna tr\u1ed3ng bao nhi\u00eau c\u00e2y cam v\u00e0 bao nhi\u00eau c\u00e2y t\u00e1o? App HOC247 Kids 121 kids.hoc247.vn","C\u00e2u 13: Trang tr\u1ea1i b\u00e1c Lin nu\u00f4i 42 g\u00e0, v\u1ecbt v\u00e0 ng\u1ed7ng. S\u1ed1 v\u1ecbt nhi\u1ec1u h\u01a1n ng\u1ed7ng 4 con, g\u00e0 nhi\u1ec1u h\u01a1n ng\u1ed7ng 2 con. H\u1ecfi c\u00f3 bao nhi\u00eau con v\u1eadt m\u1ed7i lo\u1ea1i? C\u00e2u 14: Anna v\u00e0 Mary c\u00f3 42$, Anna nhi\u1ec1u h\u01a1n Mary 10$. H\u1ecfi m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau $? C\u00e2u 15: T\u1ed5ng s\u1ed1 vi\u00ean bi c\u1ee7a An v\u00e0 Minh l\u00e0 100 vi\u00ean, hai anh em chia \u0111\u1ec1u v\u00e0o 2 h\u0169, sao cho h\u0169 th\u1ee9 nh\u1ea5t \u00edt h\u01a1n h\u0169 th\u1ee9 hai 10 vi\u00ean bi. H\u1ecfi m\u1ed7i h\u0169 c\u00f3 bao nhi\u00eau vi\u00ean bi? App HOC247 Kids 122 kids.hoc247.vn","C\u00e2u 16: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: C\u00e2u 17: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 18: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: 5 + 10 + 15 + 20 + 25 + 30 C\u00e2u 19: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 App HOC247 Kids 123 kids.hoc247.vn","C\u00e2u 20: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 21: H\u00ecnh th\u1ee9 4 c\u00f3 bao nhi\u00eau b\u00f4ng hoa? C\u00e2u 22: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 23: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: App HOC247 Kids 124 kids.hoc247.vn","C\u00e2u 24: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: 125 C\u00e2u 25: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 26: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 27: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: App HOC247 Kids kids.hoc247.vn","C\u00e2u 28: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 29: K\u1ebft qu\u1ea3 c\u1ea7n t\u00ecm l\u00e0 bao nhi\u00eau? C\u00e2u 30: C\u00f3 9 ch\u1ed7 ng\u1ed3i \u1edf h\u00e0ng gh\u1ebf th\u1ee9 1, 10 ch\u1ed7 \u1edf h\u00e0ng gh\u1ebf th\u1ee9 2, 11 ch\u1ed7 \u1edf h\u00e0ng th\u1ee9 3, \u2026 H\u1ecfi c\u00f3 bao nhi\u00eau ch\u1ed7 \u1edf h\u00e0ng gh\u1ebf th\u1ee9 7? C\u00e2u 31: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 126 kids.hoc247.vn","\u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 7 C\u00e2u 1: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 2: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 3: C\u00f3 bao nhi\u00eau s\u1ed1 chia h\u1ebft cho 3 trong kho\u1ea3ng t\u1eeb 7 \u0111\u1ebfn 29? C\u00e2u 4: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 127 kids.hoc247.vn","C\u00e2u 5: Ba b\u1ea1n Jack, Andy v\u00e0 Mary \u0111ang x\u1ebfp th\u00e0nh m\u1ed9t h\u00e0ng d\u1ecdc. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e1ch s\u1eafp x\u1ebfp v\u1ecb tr\u00ed gi\u1eefa ba b\u1ea1n? C\u00e2u 6: Khi \u0111i si\u00eau th\u1ecb, Jack r\u1ea5t th\u00edch 3 m\u00f3n \u0111\u1ed3 ch\u01a1i, bao g\u1ed3m: xe \u0111\u1ed3 ch\u01a1i, si\u00eau nh\u00e2n v\u00e0 g\u1ea5u. Nh\u01b0ng m\u1eb9 ch\u1ec9 cho mua 2 trong 3 \u0111\u1ed3 ch\u01a1i tr\u00ean. H\u1ecfi Jack c\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 ch\u1ecdn 2 trong 3 \u0111\u1ed3 ch\u01a1i tr\u00ean? C\u00e2u 7: C\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 vi\u1ebft t\u1eeb STUDY t\u1eeb h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? C\u00e2u 8: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 128 kids.hoc247.vn","C\u00e2u 9: Trong v\u01b0\u1eddn c\u00f3 24 c\u00e2y t\u00e1o v\u00e0 xo\u00e0i. S\u1ed1 c\u00e2y t\u00e1o nhi\u1ec1u h\u01a1n s\u1ed1 c\u00e2y xo\u00e0i l\u00e0 6 c\u00e2y. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y t\u00e1o, bao nhi\u00eau c\u00e2y xo\u00e0i? C\u00e2u 10: T\u1ed5ng hai s\u1ed1 l\u00e0 32. Hai s\u1ed1 h\u01a1n k\u00e9m nhau 8 \u0111\u01a1n v\u1ecb. H\u00e3y t\u00ecm 2 s\u1ed1 \u0111\u00f3. C\u00e2u 11: Nh\u00e0 b\u00e1c Lan nu\u00f4i t\u1ea5t c\u1ea3 24 con g\u00e0 v\u00e0 v\u1ecbt. S\u1ed1 g\u00e0 g\u1ea5p 2 l\u1ea7n s\u1ed1 v\u1ecbt. H\u1ecfi nh\u00e0 b\u00e1c Lan nu\u00f4i bao nhi\u00eau con g\u00e0 v\u00e0 bao nhi\u00eau con v\u1ecbt? C\u00e2u 12: V\u01b0\u1eddn nh\u00e0 Anna c\u00f3 t\u1ea5t c\u1ea3 42 c\u00e2y cam v\u00e0 t\u00e1o, s\u1ed1 c\u00e2y cam g\u1ea5p 6 l\u1ea7n s\u1ed1 c\u00e2y t\u00e1o. H\u1ecfi nh\u00e0 Anna tr\u1ed3ng bao nhi\u00eau c\u00e2y cam v\u00e0 bao nhi\u00eau c\u00e2y t\u00e1o? App HOC247 Kids 129 kids.hoc247.vn","C\u00e2u 13: V\u01b0\u1eddn nh\u00e0 Anna c\u00f3 t\u1ea5t c\u1ea3 42 c\u00e2y cam v\u00e0 t\u00e1o, s\u1ed1 c\u00e2y cam g\u1ea5p 6 l\u1ea7n s\u1ed1 c\u00e2y t\u00e1o. H\u1ecfi nh\u00e0 Anna tr\u1ed3ng bao nhi\u00eau c\u00e2y cam v\u00e0 bao nhi\u00eau c\u00e2y t\u00e1o? C\u00e2u 14: Anna v\u00e0 Mary c\u00f3 42$, Anna nhi\u1ec1u h\u01a1n Mary 10$. H\u1ecfi m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau $? C\u00e2u 15: T\u1ed5ng s\u1ed1 vi\u00ean bi c\u1ee7a An v\u00e0 Minh l\u00e0 100 vi\u00ean, hai anh em chia \u0111\u1ec1u v\u00e0o 2 h\u0169, sao cho h\u0169 th\u1ee9 nh\u1ea5t \u00edt h\u01a1n h\u0169 th\u1ee9 hai 10 vi\u00ean bi. H\u1ecfi m\u1ed7i h\u0169 c\u00f3 bao nhi\u00eau vi\u00ean bi? App HOC247 Kids 130 kids.hoc247.vn","C\u00e2u 16: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: C\u00e2u 17: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 18: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: 5 + 10 + 15 + 20 + 25 + 30 C\u00e2u 19: T\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y s\u1ed1 sau: 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 App HOC247 Kids 131 kids.hoc247.vn","C\u00e2u 20: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 21: H\u00ecnh th\u1ee9 4 c\u00f3 bao nhi\u00eau b\u00f4ng hoa? C\u00e2u 22: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: C\u00e2u 23: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: App HOC247 Kids 132 kids.hoc247.vn","C\u00e2u 24: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: 133 C\u00e2u 25: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 26: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 27: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: App HOC247 Kids kids.hoc247.vn","C\u00e2u 28: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 29: T\u00ecm h\u00ecnh c\u00f2n thi\u1ebfu: C\u00e2u 30: C\u00f3 9 ch\u1ed7 ng\u1ed3i \u1edf h\u00e0ng gh\u1ebf th\u1ee9 1, 10 ch\u1ed7 \u1edf h\u00e0ng gh\u1ebf th\u1ee9 2, 11 ch\u1ed7 \u1edf h\u00e0ng th\u1ee9 3, \u2026 H\u1ecfi c\u00f3 bao nhi\u00eau ch\u1ed7 \u1edf h\u00e0ng gh\u1ebf th\u1ee9 7? C\u00e2u 31: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang: App HOC247 Kids 134 kids.hoc247.vn"]