{"segment":[{"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":[[["-2688","- 2688"," -2688"," - 2688 "," - 2688 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv2/img\/2.jpg' \/><\/center>-5813 - (-3125) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-5813 - (-3125)&= -5813 + 3125\\\\&= -(5813 - 3125)\\\\&= -2688\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -2688<\/span><\/span> <br\/> "}]}],"id_ques":1111},{"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":[[["2215"," 2215","+2215","+ 2215"," 2215 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv2/img\/2.jpg' \/><\/center>-1427 - (-3642) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-1427 - (-3642)&= -1427 + 3642\\\\&= 3642 - 1427\\\\&= 2215\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 2215<\/span><\/span> <br\/> "}]}],"id_ques":1112},{"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":[[["-11221"," -11221","- 11221","- 11221 "," -11221 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv2/img\/2.jpg' \/><\/center>721 - 11942 = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}721 - 11942&= 721 + (-11942)\\\\&= -(11942 - 721)\\\\&= -11221\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -11221<\/span><\/span> <br\/> "}]}],"id_ques":1113},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["17"," 17","+ 17","+ 17 ","+17 "],["-12"," -12","- 12"," -12 "]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>8<\/th><th>-6<\/th><\/tr><tr><td>b<\/td><td>-9<\/td><td>6<\/td><\/tr><tr><td>a - b<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <b>+ a = 8; b = -9 th\u00ec:<\/b> <br\/>$\\begin{align*}a - b &= 8 - (-9)\\\\&= 8 + 9\\\\&= 17\\end{align*}$<br\/><b>+ a = -6; b = 6 th\u00ec:<\/b><br\/>$\\begin{align*}a - b&= -6 - 6\\\\&= -6 + (-6)\\\\&= - (6 + 6)\\\\&= -12\\end{align*}$<br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'>17; -12<\/span><\/span> <br\/>"}]}],"id_ques":1114},{"time":9,"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\u00ecm x, bi\u1ebft:<br\/>x - 10 = -35 - 5 ","select":["A. x = 30","B. x = -30","C. x = 50","D. x = -50"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: T\u00ednh v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: T\u00ecm x<br\/><b> L\u01b0u \u00fd: <\/b> <b><i> x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 b\u1ecb tr\u1eeb, mu\u1ed1n t\u00ecm s\u1ed1 b\u1ecb tr\u1eeb ta l\u1ea5y hi\u1ec7u c\u1ed9ng v\u1edbi s\u1ed1 tr\u1eeb<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - 10 &= -35 - 5\\\\x -10&= - (35 + 5) \\\\x - 10&= -40\\\\x&= -40 + 10\\\\x&= -30\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. x = -30<\/span><\/span> <br\/>","column":2}]}],"id_ques":1115},{"time":9,"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\/>x - 120 = -36 - (- 5) ","select":["A. x = 89","B. x = -89","C. x = 151","D. x = -151"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: T\u00ednh v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: T\u00ecm x<br\/><b> L\u01b0u \u00fd: <\/b> <b><i> x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 b\u1ecb tr\u1eeb, mu\u1ed1n t\u00ecm s\u1ed1 b\u1ecb tr\u1eeb ta l\u1ea5y hi\u1ec7u c\u1ed9ng v\u1edbi s\u1ed1 tr\u1eeb<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - 120 &= -36 - (-5)\\\\x -120&= -36 + 5 \\\\x - 120&= -(36 - 5)\\\\x - 120&= -31\\\\x&= -31 + 120\\\\x&= 120 - 31\\\\x&= 89\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = 89<\/span><\/span> <br\/>","column":2}]}],"id_ques":1116},{"time":9,"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\/>-8 - x = -15 - 23 ","select":["A. x = 30","B. x = -30","C. x = 46","D. x = -46"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: T\u00ednh v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: T\u00ecm x<br\/><b> L\u01b0u \u00fd: <\/b> <b><i> x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 tr\u1eeb, mu\u1ed1n t\u00ecm s\u1ed1 tr\u1eeb ta l\u1ea5y s\u1ed1 b\u1ecb tr\u1eeb tr\u1eeb hi\u1ec7u<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-8 - x &= -15 - 23\\\\-8 - x&= -(15 + 23) \\\\-8 - x&= -38\\\\x&= -8 - (-38)\\\\x&= -8 + 38\\\\x&= 38 - 8\\\\x&= 30\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = 30<\/span><\/span> <br\/>","column":2}]}],"id_ques":1117},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Chi\u1ebfc di\u1ec1u c\u1ee7a b\u1ea1n Linh \u0111ang \u1edf \u0111\u1ed9 cao 15m so v\u1edbi m\u1eb7t \u0111\u1ea5t. Sau m\u1ed9t l\u00fac \u0111\u1ed9 cao c\u1ee7a chi\u1ebfc di\u1ec1u gi\u1ea3m 5m, r\u1ed3i sau \u0111\u00f3 l\u1ea1i t\u0103ng th\u00eam 4m. H\u1ecfi chi\u1ebfc di\u1ec1u cao bao nhi\u00eau m\u00e9t so v\u1edbi m\u1eb7t \u0111\u1ea5t sau 2 l\u1ea7n thay \u0111\u1ed5i \u0111\u1ed9 cao? ","select":["A. 10m","B. 14m","C. 24m","D. 7m"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>+ Gi\u1ea3m 5m t\u1ee9c l\u00e0:<b>- 5m<\/b><br\/>+ T\u0103ng th\u00eam 4m t\u1ee9c l\u00e0: <b> + 4m<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>\u0110\u1ed9 cao c\u1ee7a chi\u1ebfc di\u1ec1u so v\u1edbi m\u1eb7t \u0111\u1ea5t sau 2 l\u1ea7n thay \u0111\u1ed5i l\u00e0:<br\/>15 - 5 + 4 = 14 (m)<br\/>\u0110\u00e1p s\u1ed1: 14m<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. 14m<\/span><\/span> <br\/>","column":2}]}],"id_ques":1118},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" M\u1ed9t chi\u1ebfc m\u00e1y bay \u0111ang \u1edf \u0111\u1ed9 cao 1254m so v\u1edbi m\u1eb7t \u0111\u1ea5t. Sau m\u1ed9t l\u00fac \u0111\u1ed9 cao c\u1ee7a m\u00e1y bay t\u0103ng 150m, sau \u0111\u00f3 l\u1ea1i gi\u1ea3m \u0111i 230m. H\u1ecfi m\u00e1y bay bay cao bao nhi\u00eau m\u00e9t so v\u1edbi m\u1eb7t \u0111\u1ea5t sau 2 l\u1ea7n thay \u0111\u1ed5i \u0111\u1ed9 cao? ","select":["A. 1024m","B. 874m","C. 1174m","D. 1634m"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>+ T\u0103ng 150m t\u1ee9c l\u00e0:<b>+ 150m<\/b><br\/>+ Gi\u1ea3m \u0111i 230m t\u1ee9c l\u00e0: <b> - 230m<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Mays bay bay cao so v\u1edbi m\u1eb7t \u0111\u1ea5t sau 2 l\u1ea7n thay \u0111\u1ed5i l\u00e0:<br\/>1254 + 150 - 230 = 1174 (m)<br\/>\u0110\u00e1p s\u1ed1: 1174m<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 1174m<\/span><\/span> <br\/>","column":2}]}],"id_ques":1119},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"91 - 87 <span class='basic_hoi_black'>?<\/span> (-87) + 91 ","select":[">","<","="],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> a - b = a + (-b) = (-b) + a<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3:<br\/><b>91 - 87 <\/b>= 91 + (-87) <b>= (-87) + 91<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> =<\/span><\/span> <br\/>","column":3}]}],"id_ques":1120},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"36 - 75 <span class='basic_hoi_black'>?<\/span> 132 - 185 ","select":[">","<","="],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a t\u1eebng v\u1ebf<br\/>B\u01b0\u1edbc 2: So s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c \u0111\u1ec3 \u0111\u01b0a ra \u0111\u00e1p \u00e1n \u0111\u00fang.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\underbrace{36 - 75}_{-39} $ <span class='basic_hoi_black'>?<\/span> $\\underbrace{132 - 185}_{-53} $ <br\/>M\u00e0 <b>-39 > -53<\/b><br\/>N\u00ean <b>36 - 75 > 132 - 185<\/b> <br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> ><\/span><\/span> <br\/>","column":3}]}],"id_ques":1121},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"421 - 535 <span class='basic_hoi_black'>?<\/span> -21 - 115 ","select":[">","<","="],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ednh k\u1ebft qu\u1ea3 c\u1ee7a t\u1eebng v\u1ebf<br\/>B\u01b0\u1edbc 2: So s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c \u0111\u1ec3 \u0111\u01b0a ra \u0111\u00e1p \u00e1n \u0111\u00fang.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\underbrace{421 - 535}_{-114} $ <span class='basic_hoi_black'>?<\/span> $\\underbrace{-21 - 115}_{-136} $ <br\/>M\u00e0 <b>-114 > -136<\/b><br\/>N\u00ean <b>421 - 535 > -21 - 115<\/b> <br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> ><\/span><\/span> <br\/>","column":3}]}],"id_ques":1122},{"time":9,"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: <br\/>A = m - 112 - n v\u1edbi m = -9; n = 35","select":["A = -86","A = 86","A = -156","A = 156"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay gi\u00e1 tr\u1ecb c\u1ee7a m, n v\u00e0o bi\u1ec3u th\u1ee9c<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c<br\/><b>L\u01b0u \u00fd: <\/b> <b><i>Bi\u1ec3u th\u1ee9c ch\u1ec9 ch\u1ee9a ph\u00e9p t\u00ednh c\u1ed9ng v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00e1i qua ph\u1ea3i.<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay m = -9; n = 35 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&= -9 - 112 - 35\\\\A&= -9 + (-112) - 35 \\\\A&= -(9 + 112) - 35\\\\ A&= -121 - 35\\\\A&= - 121 + (-35)\\\\A&= -(121 + 35)\\\\A&= -156\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A = -156<\/span><\/span> <br\/>","column":2}]}],"id_ques":1123},{"time":9,"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\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: <br\/>A = 42 + m - n v\u1edbi m = -12; n = 81","select":["A = -51","A = 51","A = -135","A = 135"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay gi\u00e1 tr\u1ecb c\u1ee7a m, n v\u00e0o bi\u1ec3u th\u1ee9c<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c<br\/><b>L\u01b0u \u00fd: <\/b> <b><i>Bi\u1ec3u th\u1ee9c ch\u1ec9 ch\u1ee9a ph\u00e9p t\u00ednh c\u1ed9ng v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00e1i qua ph\u1ea3i.<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay m = -12; n = 81 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&= 42 + (-12) - 81\\\\A&= (42 - 12) + (-81) \\\\A&= 30 + (-81)\\\\ A&= -(81 - 30)\\\\A&= -51\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A = -51<\/span><\/span> <br\/>","column":2}]}],"id_ques":1124},{"time":9,"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\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: <br\/>A = x + 8 - x + 20","select":["A = -28","A = 12","A = -12","A = 28"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m x v\u00e0 -x \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u00ednh nhanh (v\u00ec x v\u00e0 -x l\u00e0 hai s\u1ed1 \u0111\u1ed1i nhau)<br\/><b>L\u01b0u \u00fd:<\/b> Hai s\u1ed1 \u0111\u1ed1i nhau c\u00f3 t\u1ed5ng b\u1eb1ng 0<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}A&= x + 8 - x + 20\\\\A&= [x + (-x)] + (8 + 20)\\\\A&= 0 + 28\\\\ A&= 28\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A = 28<\/span><\/span> <br\/>","column":2}]}],"id_ques":1125},{"time":9,"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\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: <br\/>A = x + 4 + (-35) + (-x)","select":["A = -31","A = 31","A = -39","A = 39"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m x v\u00e0 -x \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u00ednh nhanh (v\u00ec x v\u00e0 -x l\u00e0 hai s\u1ed1 \u0111\u1ed1i nhau)<br\/><b>L\u01b0u \u00fd:<\/b> Hai s\u1ed1 \u0111\u1ed1i nhau c\u00f3 t\u1ed5ng b\u1eb1ng 0<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}A&= x + 4 + (-35) + (-x)\\\\A&= [x + (-x)] + [4 + (-35) ]\\\\A&= 0 + (-31)\\\\ A&= -31\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A = -31<\/span><\/span> <br\/>","column":2}]}],"id_ques":1126},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"2 . 3 - 8 = <span class='basic_hoi_black'>?<\/span>","select":["A. -1","B. -2","C. 14","D. -14"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c ch\u1ee9a ph\u00e9p t\u00ednh nh\u00e2n v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p nh\u00e2n tr\u01b0\u1edbc, t\u00ednh ph\u00e9p tr\u1eeb sau.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}2 . 3 - 8&= 6 - 8 \\\\&= 6 + (-8)\\\\ &= -2\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>B. -2<\/span><\/span> <br\/>","column":2}]}],"id_ques":1127},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"4 . 5 - 25 = <span class='basic_hoi_black'>?<\/span>","select":["A. -5","B. 5","C. 45","D. -45"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c ch\u1ee9a ph\u00e9p t\u00ednh nh\u00e2n v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p nh\u00e2n tr\u01b0\u1edbc, t\u00ednh ph\u00e9p tr\u1eeb sau.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}4 . 5 - 25&= 20 - 25 \\\\&= 20 + (-25)\\\\ &= -5\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A. -5<\/span><\/span> <br\/>","column":2}]}],"id_ques":1128},{"time":9,"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/bai23/lv2/img\/2.jpg' \/><\/center>18 - 6 . 7 = -24. \u0110\u00fang hay sai?","select":["A. \u0110\u00fang","B. Sai"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c ch\u1ee9a ph\u00e9p t\u00ednh nh\u00e2n v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p nh\u00e2n tr\u01b0\u1edbc, t\u00ednh ph\u00e9p tr\u1eeb sau.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}18 - 6 . 7&= 18 - 42\\\\&= 18 + (-42)\\\\ &= -24\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n: <span class='basic_pink'>A. \u0110\u00fang<\/span><\/span> <br\/>","column":2}]}],"id_ques":1129},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv2/img\/2.jpg' \/><\/center>4 - 2 . 7 = 14. \u0110\u00fang hay sai?","select":["A. \u0110\u00fang","B. Sai"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c ch\u1ee9a ph\u00e9p t\u00ednh nh\u00e2n v\u00e0 ph\u00e9p t\u00ednh tr\u1eeb n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p nh\u00e2n tr\u01b0\u1edbc, t\u00ednh ph\u00e9p tr\u1eeb sau.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}4 - 2 . 7&= 4 - 14\\\\&= 4 + (-14)\\\\ &= -10\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n: <span class='basic_pink'>B. Sai<\/span><\/span> <br\/>","column":2}]}],"id_ques":1130}],"lesson":{"save":0,"level":2}}