{"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":[[["-1080"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv1/img\/2.jpg' \/><\/center>(-135) . 8= _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}(-135) . 8&= -(135 . 8)\\\\&= -1080\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -1080<\/span><\/span> <br\/> "}]}],"id_ques":1231},{"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":[[["-856"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv1/img\/2.jpg' \/><\/center>(-214) . 4= _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}(-214) . 4&= -(214 . 4)\\\\&= -856\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -856<\/span><\/span> <br\/> "}]}],"id_ques":1232},{"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":[[["-690"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv1/img\/5.jpg' \/><\/center>138 . (-5)= _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}138 . (-5)&= -(138 . 5)\\\\&= -690\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -690<\/span><\/span> <br\/> "}]}],"id_ques":1233},{"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\/>(-3) . (-15) = <span class='basic_hoi_black'>?<\/span>","select":["A. -45","B. 55","C. 45","D. -55"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-3) . (-15) = 3 . 15 = 45<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 45<\/span><\/span> <br\/>","column":2}]}],"id_ques":1234},{"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\u00ednh nhanh:<br\/>(-8) . (-4) = <span class='basic_hoi_black'>?<\/span>","select":["A. 32","B. -32","C. -36","D. -40"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-8) . (-4) = 8 . 4 = 32<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u0111\u00fang l\u00e0: <span class='basic_pink'> A. 32<\/span><\/span> <br\/>","column":2}]}],"id_ques":1235},{"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\u00ednh nhanh:<br\/>(-7) . (-5) = <span class='basic_hoi_black'>?<\/span>","select":["A. 30","B. -30","C. -35","D. 35"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-7) . (-5) = 7 . 5 = 35<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u0111\u00fang l\u00e0: <span class='basic_pink'> D. 35<\/span><\/span> <br\/>","column":2}]}],"id_ques":1236},{"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":" (-15) . (-2) <span class='basic_hoi_black'>?<\/span> 0","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 v\u1ebf tr\u00e1i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c v\u1edbi s\u1ed1 \u0111\u00e3 cho \u1edf v\u1ebf ph\u1ea3i<br\/><b>L\u01b0u \u00fd:<\/b><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-15) . (-2)}_{30} $ <span class='basic_hoi_black'>?<\/span> 0<br\/>M\u00e0 30 > 0<br\/>N\u00ean (-15) . (-2) > 0<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> ><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1237},{"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":" (-3) . 7 <span class='basic_hoi_black'>?<\/span> 0","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 v\u1ebf tr\u00e1i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c v\u1edbi s\u1ed1 \u0111\u00e3 cho \u1edf v\u1ebf ph\u1ea3i<br\/><b>L\u01b0u \u00fd:<\/b><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-3) . 7}_{-21} $ <span class='basic_hoi_black'>?<\/span> 0<br\/>M\u00e0 -21 < 0<br\/>N\u00ean (-3) . 7 < 0<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> <<\/span><\/span> <br\/> ","column":3}]}],"id_ques":1238},{"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":" (-18) . (-7) <span class='basic_hoi_black'>?<\/span> 126","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 v\u1ebf tr\u00e1i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c v\u1edbi s\u1ed1 \u0111\u00e3 cho \u1edf v\u1ebf ph\u1ea3i<br\/><b>L\u01b0u \u00fd:<\/b><br\/>Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-18) . (-7)}_{126} $ <span class='basic_hoi_black'>?<\/span> 126<br\/>N\u00ean (-18) . (-7) = 126<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> =<\/span><\/span> <br\/> ","column":3}]}],"id_ques":1239},{"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":[[["-20"],["27"]]],"list":[{"point":5,"width":60,"type_input":"","ques":" <table><tr><th>a<\/th><th>5<\/th><th>-3<\/th><\/tr><tr><td>b<\/td><td>-4<\/td><td>-9<\/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 nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>+ a = 5; b = -4 th\u00ec:<br\/>$\\begin{align*}a . b&= 5 . (-4) \\\\&= -(5 . 4)\\\\&= -20\\end{align*}$<br\/>+ a = -3; b = -9 th\u00ec:<br\/>$\\begin{align*}a . b&= (-3) . (-9) \\\\&= 3 . 9\\\\&= 27\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'> -20; 27<\/span><\/span> <br\/> "}]}],"id_ques":1240},{"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":[[["12"],["-16"]]],"list":[{"point":5,"width":60,"type_input":"","ques":" <table><tr><th>a<\/th><th>-3<\/th><th>-8<\/th><\/tr><tr><td>b<\/td><td>-4<\/td><td>2<\/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 nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>+ a = -3; b = -4 th\u00ec:<br\/>$\\begin{align*}a . b&= (-3) . (-4) \\\\&= 3 . 4\\\\&= 12\\end{align*}$<br\/>+ a = -8; b = 2 th\u00ec:<br\/>$\\begin{align*}a . b&= (-8) . 2 \\\\&= -(8 . 2)\\\\&= -16\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'> 12; -16<\/span><\/span> <br\/> "}]}],"id_ques":1241},{"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/bai26/lv1/img\/2.jpg' \/><\/center> S\u1ed1 \u00e2m x S\u1ed1 \u00e2m = S\u1ed1 d\u01b0\u01a1ng. \u0110\u00fang hay sai?","select":[" A. \u0110\u00fang"," B. Sai "],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>S\u1ed1 \u00e2m x S\u1ed1 \u00e2m = S\u1ed1 d\u01b0\u01a1ng<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n: <span class='basic_pink'> A. \u0110\u00fang<\/span><\/span> <br\/> ","column":2}]}],"id_ques":1242},{"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 a l\u00e0 m\u1ed9t s\u1ed1 nguy\u00ean d\u01b0\u01a1ng. H\u1ecfi b l\u00e0 s\u1ed1 nguy\u00ean \u00e2m hay nguy\u00ean d\u01b0\u01a1ng n\u1ebfu t\u00edch a . b l\u00e0 s\u1ed1 nguy\u00ean \u00e2m?","select":[" A. S\u1ed1 nguy\u00ean \u00e2m"," B. S\u1ed1 nguy\u00ean d\u01b0\u01a1ng "],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> S\u1ed1 \u00e2m x S\u1ed1 d\u01b0\u01a1ng = S\u1ed1 \u00e2m<br\/> M\u00e0 a l\u00e0 s\u1ed1 nguy\u00ean d\u01b0\u01a1ng, a . b l\u00e0 s\u1ed1 nguy\u00ean \u00e2m n\u00ean b l\u00e0 s\u1ed1 nguy\u00ean \u00e2m.<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n: <span class='basic_pink'> A. S\u1ed1 nguy\u00ean \u00e2m<\/span><\/span> <br\/> ","column":2}]}],"id_ques":1243},{"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":" (-2) . (-2) . (-2) . (-2) . (-2) . (-2) . (-2) = <span class='basic_hoi_black'>?<\/span>","select":["A. $-2^7$","B. $(-2)^7$","C. $7^2$","D. $(-7)^2$"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> (-2) . (-2) . (-2) . (-2) . (-2) . (-2) . (-2) = $(-2)^7$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. $(-2)^7$<\/span> <\/span> <br\/>","column":2}]}],"id_ques":1244},{"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\/>(-5) . 125 . (-8) . 20 . (-2) = <span class='basic_hoi_black'>?<\/span>","select":["A. 200 000","B. -200 000","C. -100 000","D. 100 000"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m c\u00e1c c\u1eb7p c\u00f3 t\u00edch l\u00e0 s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m, tr\u00f2n ngh\u00ecn.... \u0111\u1ec3 t\u00ednh nhanh<br\/><b>L\u01b0u \u00fd:<\/b><br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-5) . 125 . (-8) . 20 . (-2)\\\\&= [125 . (-8)] . [(-5) . 20] . (-2)\\\\&= -(125 . 8) . [-(5 . 20)] . (-2)\\\\&= (-1000) . (-100) . (-2)\\\\&= 100 000 . (-2)\\\\&= -200 000\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. -200 000<\/span><\/span> <br\/>","column":2}]}],"id_ques":1245},{"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\u00ednh nhanh:<br\/>(-2) . 4 . (-5) . (-15) = <span class='basic_hoi_black'>?<\/span>","select":["A. -600","B. 600","C. -700","D. 700"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m c\u00e1c c\u1eb7p c\u00f3 t\u00edch l\u00e0 s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m, tr\u00f2n ngh\u00ecn.... \u0111\u1ec3 t\u00ednh nhanh<br\/><b>L\u01b0u \u00fd:<\/b><br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-2) . 4 . (-5) . (-15)\\\\&= [(-2) . (-5)] . [(-15) . 4] \\\\&= (2. 5) . [-(15 . 4)] \\\\&= 10 . (-60)\\\\&= -600\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. -600<\/span><\/span> <br\/>","column":2}]}],"id_ques":1246},{"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":" Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: (3 + x) . (x - 2) khi x = -5 l\u00e0:","select":["A. 9","B. -9","C. -14","D. 14"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Thay gi\u00e1 tr\u1ecb c\u1ee7a x v\u00e0o bi\u1ec3u th\u1ee9c r\u1ed3i th\u1ef1c hi\u1ec7n t\u00ednh.<br\/><b>L\u01b0u \u00fd:<\/b><br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -5 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}&[3 + (-5)] . (-5 - 2)\\\\&= (3 - 5) . [- (5 + 2)]\\\\&= [-(5 - 3)] . (-7)\\\\&= (-2) . (-7)\\\\&=2 . 7\\\\& = 14\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. 14<\/span><\/span> <br\/>","column":2}]}],"id_ques":1247},{"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":" Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: (x - 1) . (x - 2) khi x = -3 l\u00e0:","select":["A. 9","B. -9","C. 20","D. -20"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Thay gi\u00e1 tr\u1ecb c\u1ee7a x v\u00e0o bi\u1ec3u th\u1ee9c r\u1ed3i th\u1ef1c hi\u1ec7n t\u00ednh.<br\/><b>L\u01b0u \u00fd:<\/b><br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang<br\/>+ Mu\u1ed1n nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta nh\u00e2n hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a ch\u00fang r\u1ed3i \u0111\u1eb7t d\u1ea5u (-) tr\u01b0\u1edbc k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -3 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}&(-3 - 1) . (-3 - 2)\\\\&= [-(3 + 1)] . [-(3 + 2)]\\\\&= (-4) . (-5)\\\\&= 4 . 5\\\\&=20\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 20<\/span><\/span> <br\/>","column":2}]}],"id_ques":1248},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv1/img\/2.jpg' \/><\/center> $(-1)^{101}$ = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>$(-1)^{101}$ = $\\underbrace{(-1) . (-1) ... (-1)}_{101 s\u1ed1}$ = -1<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -1<\/span><\/span> <br\/><br\/><span class='basic_left'><span class='basic_green'>Nh\u1eadn x\u00e9t:<\/span><br\/>+ T\u00edch m\u1ed9t s\u1ed1 ch\u1eb5n th\u1eeba s\u1ed1 nguy\u00ean \u00e2m s\u1ebd mang d\u1ea5u (+)<br\/>+ T\u00edch m\u1ed9t s\u1ed1 l\u1ebb th\u1eeba s\u1ed1 nguy\u00ean \u00e2m s\u1ebd mang d\u1ea5u (-)<\/span><\/span>"}]}],"id_ques":1249},{"time":24,"part":[{"title":"Trong c\u00e1c \u0111\u00e1p \u00e1n sau, \u0111\u00e1p \u00e1n n\u00e0o sai?","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" H\u00e3y ch\u1ecdn c\u00e1ch nh\u1eadn bi\u1ebft d\u1ea5u t\u00edch sai:","select":["(+) . (+) $\\rightarrow$ (+)","(+) . (-) $\\rightarrow$ (-)","(-) . (+) $\\rightarrow$ (-)","(-) . (-) $\\rightarrow$ (-)"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(+) . (+) $\\rightarrow$ (+)<br\/>(-) . (-) $\\rightarrow$ (+)<br\/>(-) . (+) $\\rightarrow$ (-)<br\/>(+) . (-) $\\rightarrow$ (-)<br\/>V\u1eady \u0111\u00e1p \u00e1n sai l\u00e0:<span class='basic_pink'> (-) . (-) $\\rightarrow$ (-)<\/span><\/span> <br\/>","column":2}]}],"id_ques":1250}],"lesson":{"save":0,"level":1}}