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{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"T\u00ecm x bi\u1ebft: <br\/> 4.(x + 41) = 400","select":["A. x = 56 ","B. x = 57 ","C. x = 58 ","D. x = 59 "],"hint":"Th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft b\u1eb1ng t\u00edch chia th\u1eeba s\u1ed1 \u0111\u00e3 bi\u1ebft, s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft b\u1eb1ng t\u1ed5ng tr\u1eeb s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft","explain":"H\u01b0\u1edbng d\u1eabn: <br\/> <\/span> B\u01b0\u1edbc 1: <\/b> Coi x + 41 l\u00e0 th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft ta l\u1ea5y t\u00edch chia s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/> B\u01b0\u1edbc 2: <\/b> x l\u00e0 s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft ta l\u1ea5y t\u1ed5ng tr\u1eeb \u0111i s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/><\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/>Ta c\u00f3: $$\\begin{align*} 4. (x + 41) &= 400 \\\\ x + 41 &= 400 : 4 \\\\ x + 41 &= 100 \\\\ x &= 100 - 41 \\\\ x &= 59\\end{align*}$$V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. x = 59<\/span>","column":2}]}],"id_ques":171},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"T\u00ecm x bi\u1ebft: <br\/> 15 + 5x = 40","select":["A. x = 5 ","B. x = 6 ","C. x = 4 ","D. x = 7 "],"hint":"S\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft b\u1eb1ng t\u1ed5ng tr\u1eeb s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft, th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft b\u1eb1ng t\u00edch chia th\u1eeba s\u1ed1 \u0111\u00e3 bi\u1ebft ","explain":"H\u01b0\u1edbng d\u1eabn: <br\/> <\/span> B\u01b0\u1edbc 1: <\/b> Coi 5x l\u00e0 s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft ta l\u1ea5y t\u1ed5ng tr\u1eeb \u0111i s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/> B\u01b0\u1edbc 2: <\/b> x l\u00e0 th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft ta l\u1ea5y t\u00edch chia s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/><\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/>Ta c\u00f3: $$\\begin{align*}15 + 5x &= 40 \\\\ 5x &= 40 - 15 \\\\ 5x &= 25 \\\\ x &= 5\\end{align*}$$V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. x = 5<\/span>","column":2}]}],"id_ques":172},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["129"],["32"],["300"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng \u0111\u1ec3 ho\u00e0n th\u00e0nh ph\u00e9p t\u00ednh sau b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/>71 + 68 + 129 + 32 = (71 +_input_) + (68 + _input_) = _input_ ","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p \u0111\u1ec3 nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng l\u1ea1i \u0111\u1ec3 khi c\u1ed9ng \u0111\u01b0\u1ee3c s\u1ed1 tr\u00f2n ch\u1ee5c <\/span><br\/> <br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} 71 + 68 + 129 + 32 &= 71 + 129 + 68 + 32 (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n})\\\\ &= (71 + 129) + (68 + 32) (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p})\\\\ &= 200 + 100 \\\\ &= 300 \\end{align*}$ <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi l\u00e0: 129; 32; 300<\/span>"}]}],"id_ques":173},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["25"],["24"],["1000"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng \u0111\u1ec3 ho\u00e0n th\u00e0nh ph\u00e9p t\u00ednh sau b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/> 25.16 + 25.24 = _input_.(16 + _input_) = _input_","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng<br\/> a.(b + c) = a.b + a.c <\/b> <\/span><br\/> <br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} 25.16 + 25.24 &= 25.(16 + 24) \\\\ &= 25. 40 \\\\ &= 1000 \\end{align*}$ <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi l\u00e0: 25; 24; 1000<\/span>"}]}],"id_ques":174},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["131"],["69"],["368"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng \u0111\u1ec3 ho\u00e0n th\u00e0nh ph\u00e9p t\u00ednh sau b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/> (168 + 131) + 69= 168 + (_input_ + _input_) = _input_","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p ph\u00e9p c\u1ed9ng<br\/> (a + b) + c = a + (b + c) <\/b> <\/span><br\/> <br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} (168 + 131) + 69 &= 168 +(131 + 69) \\\\ &= 168 + 200 \\\\ &= 368 \\end{align*}$ <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi l\u00e0: 131; 69; 368<\/span>"}]}],"id_ques":175},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"T\u00ednh nhanh: <br\/> 20 + 21 + 22 + 23 + ... + 30 = ?","select":["A. 272 ","B. 275 ","C. 280 ","D. 250 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng <br\/> B\u01b0\u1edbc 1: <\/b> Nh\u1eadn th\u1ea5y 20 + 30 = 50 n\u00ean ta nh\u00f3m 20 + 30; 21 + 29 = 50 n\u00ean ta nh\u00f3m 21 + 29,....<br\/> B\u01b0\u1edbc 2: <\/b> T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh (20 + 30) + (21 + 29) + ...<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> $\\begin{align*} 20 + 21 + 22 + 23 + ... + 30 &= 20 + 30 + 21 + 29 + 22 + 28 + 23 + 27 + 24 + 26 + 25 (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n}) \\\\ &= (20 + 30) + (21 + 29) + (22 + 28) + (23 + 27) + (24 + 26) + 25 (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p}) \\\\ &= 50 + 50 + 50 + 50 + 50 + 25 \\\\ &= 275 \\end{align*}$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":2}]}],"id_ques":176},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"T\u00ednh nhanh: <br\/> 12 + 14 + 16 + 18 + 20 + ... + 98 = ?","select":["A. 2410 ","B. 2430","C. 2420 ","D. 2450 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng <br\/> B\u01b0\u1edbc 1: <\/b> Nh\u1eadn th\u1ea5y 12 + 98 = 110 n\u00ean ta nh\u00f3m 12 + 98 ; 13 + 97 = 110 n\u00ean ta nh\u00f3m 13 + 97....<br\/> B\u01b0\u1edbc 2: <\/b> T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh (12 + 98) + (13 + 97)....<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> D\u00e3y 12 + 14 + 16 + 18 + ... + 98 c\u00f3 s\u1ed1 s\u1ed1 h\u1ea1ng l\u00e0: <br\/>(98 - 12) : 2 + 1 = 44 s\u1ed1 h\u1ea1ng $\\begin{align*} 12 + 14 + 16 + 18 + ... + 98 &= 12 + 98 + 13 + 97 + ... + 44 + 46 (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n}) \\\\ &= (12 + 98) + (13 + 97) + ... + (44 + 46) (\\text{\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p}) \\\\ &= 110 + 110 + .... + 110 (\\text{22 s\u1ed1 h\u1ea1ng})\\\\ &= 110.22 \\\\ &= 2420 \\end{align*}$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C <\/span>","column":2}]}],"id_ques":177},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" Cho t\u1eadp h\u1ee3p K g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean x = a + b trong \u0111\u00f3 a $\\in$ {45}; b $\\in$ {38; 21; 49}","select":["A. K = {153}","B. K = {83; 21; 49} ","C. K = {38; 66; 49} ","D. K = {83; 66; 94} "],"hint":"L\u1ea5y 45 c\u1ed9ng l\u1ea7n l\u01b0\u1ee3t v\u1edbi c\u00e1c ph\u1ea7n t\u1eed {38; 21; 49}","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>L\u1ea5y 45 c\u1ed9ng l\u1ea7n l\u01b0\u1ee3t v\u1edbi 38; 21 v\u00e0 49 <br\/>45 + 38 = ?; 45 + 21 = ?; 45 + 49 = ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> T\u1eadp h\u1ee3p K g\u1ed3m c\u00e1c ph\u1ea7n t\u1eed x nh\u01b0 sau: <br\/> x = 45 + 38 = 83<br\/> x = 45 + 21 = 66 <br\/> x = 45 + 49 = 94 <br\/> V\u1eady K = {83; 66; 94} <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D <\/span>","column":2}]}],"id_ques":178},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Cho t\u1eadp h\u1ee3p L g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean x = a.b trong \u0111\u00f3 a $\\in$ {34; 47}; b $\\in$ {25; 16}","select":["A. L = {850; 544; 1175; 752}","B. L = {850; 47; 25; 16} ","C. L = {850; 544; 25;16} ","D. L = {850; 544; 1175; 385} "],"hint":"L\u1ea5y l\u1ea7n l\u01b0\u1ee3t c\u00e1c ph\u1ea7n t\u1eed c\u1ee7a t\u1eadp h\u1ee3p {34; 47} nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi c\u00e1c ph\u1ea7n t\u1eed c\u1ee7a t\u1eadp h\u1ee3p {25; 16}","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>L\u1ea5y 34 nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi 25; 16 <br\/>34.25 = ?; 34.16 = ? <br\/> L\u1ea5y 47 nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi 25 v\u00e0 16<br\/> 47.25 = ?; 47.16 = ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> T\u1eadp h\u1ee3p L g\u1ed3m c\u00e1c ph\u1ea7n t\u1eed x nh\u01b0 sau: <br\/> x = 34.25 = 850 <br\/> x = 34. 16 = 544 <br\/> x = 47 . 25 = 1175 <br\/> x = 47 . 16 = 752<br\/> V\u1eady L = {850; 544; 1175; 752} <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span>","column":2}]}],"id_ques":179},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Ch\u1ecdn ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 KH\u00c1C v\u1edbi k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh 9 . 6 . 35","select":["A. 3 . 7 . 18","B. 42 . 45 ","C. 63 . 6 . 5 ","D. 14 . 9 . 15 "],"hint":"Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 trong t\u1eebng \u0111\u00e1p \u00e1n v\u00e0 so s\u00e1nh v\u1edbi 9 . 6 . 35","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>A - T\u00e1ch 18 = 3 . 6 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 v\u00e0 so s\u00e1nh v\u1edbi 9 . 6 . 35 <br\/> B - T\u00e1ch 42 = 7.6; 45 = 5. 9 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 l\u1ea1i v\u00e0 so s\u00e1nh v\u1edbi 9 . 6 . 35 <br\/>C - T\u00e1ch 63 = 7 . 9 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 l\u1ea1i v\u00e0 so s\u00e1nh v\u1edbi 9 . 6 . 35<br\/> D - T\u00e1ch 14 = 2 . 7; 15 = 3 . 5 r\u1ed3i nh\u00f3m l\u1ea1i c\u00e1c th\u1eeba s\u1ed1 l\u1ea1i v\u00e0 so s\u00e1nh v\u1edbi 9 . 6 . 35 <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> A - Ta c\u00f3: 3 . 7 . 18 = 3 . 7 . (3 . 6) = (3 . 3) . 6 . 7 = 9 . 6 . 7 < 9 . 6 . 35<br\/> B - 42 . 45 = (6 . 7) . (5 . 9) = 9 . 6 . (5 . 7) = 9 . 6 . 35<br\/> C - 63 . 6 . 5 = (7 . 9) . 6 . 5 = 9 . 6 . 35 <br\/> D - 14 . 9 . 15 = (2 . 7) . 9 . (3 . 5) = 9 . (2 . 3) . (7 . 5) = 9 . 6 . 35<br\/> V\u1eady ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 KH\u00c1C v\u1edbi k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh 9 . 6 . 35 l\u00e0: A. 3 . 7 . 18 <\/span>","column":2}]}],"id_ques":180},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" Ch\u1ecdn ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 kh\u00e1c k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh 50 . 9 . 4","select":["A. 25 . 8 . 9","B. 100 . 9 . 2 ","C. 25 . 18 . 4 ","D. 200 . 3 . 2 "],"hint":"Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 trong t\u1eebng \u0111\u00e1p \u00e1n v\u00e0 so s\u00e1nh v\u1edbi 50 . 9 . 4","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>A - T\u00e1ch 8 = 4 . 2 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 l\u1ea1i v\u00e0 so s\u00e1nh v\u1edbi t\u00edch 50 . 9 . 4<br\/> B - T\u00e1ch 100 = 50 . 2 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 th\u00edch h\u1ee3p v\u00e0 so s\u00e1nh v\u1edbi t\u00edch 50 . 9 . 4<br\/>C - T\u00e1ch 18 = 9 . 2 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 th\u00edch h\u1ee3p v\u00e0 so s\u00e1nh v\u1edbi t\u00edch 50 . 9 . 4 <br\/> D - t\u00e1ch 200 = 50 . 4 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 lth\u00edch h\u1ee3p v\u00e0 so s\u00e1nh v\u1edbi t\u00edch 50 . 9 . 4 <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> A - Ta c\u00f3: 25 . 8 . 9 = 25 . (4 . 2) . 9 = (25 . 2) . 9 . 4 = 50 . 9 . 4 <br\/> B - 100 . 9 . 2 = (50 . 2) . 9 . 2 = 50 . 9 . (2 . 2) = 50 . 9 . 4 <br\/> C - 25 . 18 . 4 = 25 . (2 . 9) . 4 = (25 . 2) . 9 . 4 = 50 . 9 . 4 <br\/> D - 200 . 3 . 2 = (50 . 4) . 3 . 2 = 50 . (3 . 2) . 4 = 50 . 6 . 4 < 50 . 9 . 4<br\/> V\u1eady ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 kh\u00e1c k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh 50 . 9 . 4 l\u00e0: D. 200 . 3 . 2 <\/span>","column":2}]}],"id_ques":181},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" T\u1ed5ng c\u1ee7a 941 538 v\u00e0 93 127 l\u00e0:","select":["A. 1 034 985","B. 1 034 665 ","C. 100 665","D. 1 034 655 "],"hint":"T\u00ednh 941 538 + 93 127 = ?","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u00ednh 941 538 + 93 127 = ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Ta c\u00f3: 941 538 + 93 127 = 1 034 665 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 1 034 665<\/span>","column":2}]}],"id_ques":182},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" T\u00edch c\u1ee7a 915 v\u00e0 580 l\u00e0:","select":["A. 530 700","B. 530 600 ","C. 530 800","D. 530 070 "],"hint":"T\u00ednh 915 . 580 = ?","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u00ednh 915 . 580 = ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Ta c\u00f3: 915 . 580 = 530 700 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 530 700<\/span>","column":2}]}],"id_ques":183},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai4/lv2/img\/4.jpg' \/><\/center> <br\/>H\u00e3y ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p thay cho d\u1ea5u ?<\/span> <br\/> 835 . (728 + 432) ?<\/span> 835 . 728 + 835 . 432","select":["A. >","B. < ","C. ="],"hint":"T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a v\u1ebf tr\u00e1i v\u00e0 v\u1ebf ph\u1ea3i r\u1ed3i so s\u00e1nh","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> VT = 835 . (728 + 432) = 835 . 728 + 835 . 432<br\/> B\u01b0\u1edbc 2:<\/b> So s\u00e1nh VT v\u1edbi VP <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Ta c\u00f3: VT = 835 . (728 + 432) = 835 . 728 + 835 . 432 <br\/> m\u00e0 VP = 835 . 728 + 835 . 432 n\u00ean VT = VP <br\/> Hay 835 . (728 + 432) = 835 . 728 + 835 . 432 <\/b> <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. = <\/span>","column":3}]}],"id_ques":184},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai4/lv2/img\/4.jpg' \/><\/center> <br\/>H\u00e3y ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p thay cho d\u1ea5u ?<\/span> <br\/> 504 913 + 384 705 ?<\/span> 932. (318 + 142)","select":["A. >","B. < ","C. ="],"hint":"T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a v\u1ebf tr\u00e1i v\u00e0 v\u1ebf ph\u1ea3i r\u1ed3i so s\u00e1nh","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh 3504 913 + 384 705 = ?; 932. (318 + 142) = ?<br\/> B\u01b0\u1edbc 2:<\/b> So s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 b\u01b0\u1edbc 1 <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Ta c\u00f3: 504 913 + 384 705 = 889 618 <br\/> $ \\begin{align*} 932 . (318 + 142) &= 932 . 460 \\\\ &= 428 720 \\end{align*}$ <br\/> M\u00e0 889 618 > 428 720 n\u00ean 3504 913 + 384 705 > 932. (318 + 142) <\/b> <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. > <\/span>","column":3}]}],"id_ques":185},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai4/lv2/img\/3.jpg' \/><\/center><br\/>T\u00ecm m\u1ed9t s\u1ed1 bi\u1ebft s\u1ed1 \u0111\u00f3 b\u1eb1ng t\u00edch c\u1ee7a 318 v\u00e0 254 g\u1ea5p l\u00ean 2 l\u1ea7n. S\u1ed1 c\u1ea7n t\u00ecm l\u00e0:","select":["A. 80772","B. 160544 ","C. 161544","D. 165544"],"hint":"T\u00edch hay g\u1ea5p l\u00ean ch\u00ednh l\u00e0 ph\u00e9p t\u00ednh nh\u00e2n","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u00ednh 318 . 254 . 2 = ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> T\u00edch c\u1ee7a 318 v\u00e0 254 g\u1ea5p l\u00ean 2 l\u1ea7n l\u00e0: <br\/> 318 . 254 . 2 = 161544 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 161544 <\/span>","column":2}]}],"id_ques":186},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai4/lv2/img\/3.jpg' \/><\/center><br\/>T\u00ecm m\u1ed9t s\u1ed1 bi\u1ebft s\u1ed1 \u0111\u00f3 b\u1eb1ng t\u1ed5ng c\u1ee7a 93128 v\u00e0 94503 r\u1ed3i g\u1ea5p l\u00ean 25 l\u1ea7n. S\u1ed1 c\u1ea7n t\u00ecm l\u00e0:","select":["A. 4 690 770","B. 4 690 005","C. 4 690 715","D. 4 690 775"],"hint":"T\u1ed5ng l\u00e0 ph\u00e9p t\u00ednh c\u1ed9ng, g\u1ea5p l\u00ean ch\u00ednh l\u00e0 ph\u00e9p t\u00ednh nh\u00e2n","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u00ednh (93128 + 94503) . 25= ? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> T\u1ed5ng c\u1ee7a 93128 v\u00e0 94503 r\u1ed3i g\u1ea5p l\u00ean 25 l\u1ea7n l\u00e0: <br\/> (93128 + 94503) . 25 = 4 690 775 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. 4 690 775 <\/span>","column":2}]}],"id_ques":187},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Cho h\u00ecnh thoi c\u00f3 \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o l\u1ea7n l\u01b0\u1ee3t l\u00e0 28cm v\u00e0 37cm. Di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0:","select":["A. $1036cm^{2}$","B. $518cm^{2}$","C. $520cm^{2}$","D. $1035cm^{2}$"],"hint":"Di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng n\u1eeda t\u00edch \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng n\u1eeda t\u00edch \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o <br\/> Hay di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0: 28 . 37 : 2<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0: <br\/> 28 . 37 : 2 = 518 ($cm^{2}$) <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":2}]}],"id_ques":188},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Cho tam gi\u00e1c ABC c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y BC b\u1eb1ng 27cm, chi\u1ec1u cao AH h\u01a1n c\u1ea1nh BC 3cm. Di\u1ec7n t\u00edch tam gi\u00e1c ABC l\u00e0:","select":["A. $405cm^{2}$","B. $810cm^{2}$","C. $81cm^{2}$","D. $410cm^{2}$"],"hint":"Di\u1ec7n t\u00edch tam gi\u00e1c b\u1eb1ng n\u1eeda t\u00edch \u0111\u1ed9 d\u00e0i \u0111\u00e1y v\u00e0 chi\u1ec1u cao t\u01b0\u01a1ng \u1ee9ng","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh chi\u1ec1u cao AH c\u1ee7a tam gi\u00e1c <br\/> B\u01b0\u1edbc 2: <\/b> T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c <br\/> Di\u1ec7n t\u00edch = \u0111\u1ed9 d\u00e0i \u0111\u00e1y x chi\u1ec1u cao : 2<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Chi\u1ec1u cao AH c\u1ee7a tam gi\u00e1c ABC l\u00e0: <br\/> 27 + 3 = 30 (cm) <br\/> Di\u1ec7n t\u00edch tam gi\u00e1c ABC l\u00e0: <br\/> 27 . 30 : 2 = 405 ($cm^{2}$)<br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span>","column":2}]}],"id_ques":189},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["8300"],["9700"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng. <br\/> <table><tr><th>m<\/th><th>83<\/th><th>97<\/th><\/tr><tr><td>65.m+ 35.m<\/td><td>_input_ <\/td><td>_input_<\/td><\/tr><\/table>","hint":"Thay m v\u00e0o v\u00e0 t\u00ednh","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i thay m v\u00e0o, nh\u00f3m m ra ngo\u00e0i v\u00e0 t\u00ednh <\/span><br\/> <br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> <table><tr><th>m<\/th><th>83<\/th><th>97<\/th><\/tr><tr><td>65.m+35.m<\/td><td>8300<\/td><td>9700<\/td><\/tr><\/table> <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 8300; 9700<\/span>"}]}],"id_ques":190}],"lesson":{"save":0,"level":2}}

Điểm của bạn.

Câu hỏi này theo dạng chọn đáp án đúng, sau khi đọc xong câu hỏi, bạn bấm vào một trong số các đáp án mà chương trình đưa ra bên dưới, sau đó bấm vào nút gửi để kiểm tra đáp án và sẵn sàng chuyển sang câu hỏi kế tiếp

Trả lời đúng trong khoảng thời gian quy định bạn sẽ được + số điểm như sau:
Trong khoảng 1 phút đầu tiên	+ 5 điểm
Trong khoảng 1 phút -> 2 phút	+ 4 điểm
Trong khoảng 2 phút -> 3 phút	+ 3 điểm
Trong khoảng 3 phút -> 4 phút	+ 2 điểm
Trong khoảng 4 phút -> 5 phút	+ 1 điểm

Quá 5 phút: không được cộng điểm

Tổng thời gian làm mỗi câu (không giới hạn)

Điểm của bạn.

Bấm vào đây nếu phát hiện có lỗi hoặc muốn gửi góp ý

Em chưa làm xong câu này