{"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":[[["309","+309"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai28/lv2/img\/2.jpg' \/><\/center>-412 + _input_ + (-115) = -218","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: G\u1ecdi s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 x<br\/>B\u01b0\u1edbc 2: T\u00ecm x<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>G\u1ecdi s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 x ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}-412 + x + (-115) &= -218\\\\-412 + x - 115 &= -218 \\\\x - (412 + 115)&= -218\\\\x - 527&= -218\\\\x&= -218 + 527\\\\x&= 309\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 309<\/span><\/span> <br\/> "}]}],"id_ques":1361},{"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":[[["288","+288"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai28/lv2/img\/10.jpg' \/><\/center> (-27) . (-15) - _input_ = 117","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: G\u1ecdi s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 x<br\/>B\u01b0\u1edbc 2: T\u00ecm x<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>G\u1ecdi s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 x ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}(-27) . (-15) - x &= 117\\\\27 . 15 - x &= 117 \\\\405 - x&= 117\\\\x&= 405 - 117\\\\x&= 288\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 288<\/span><\/span> <br\/> "}]}],"id_ques":1362},{"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\u00ednh t\u1ed5ng c\u1ee7a c\u00e1c s\u1ed1 nguy\u00ean x, bi\u1ebft: -4 $\\le$ x < 5. T\u1ed5ng l\u00e0:","select":["A. -4","B. 0","C. 5","D. -7"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a x th\u1ecfa m\u00e3n -4 $\\le$ x < 5<br\/>B\u01b0\u1edbc 2: T\u00ednh t\u1ed5ng c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a x v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>-4 $\\le$ x < 5 n\u00ean x $\\in$ {-4; -3; -2; -1; 0 ; 1; 2; 3; 4 }<br\/>T\u1ed5ng c\u00e1c s\u1ed1 nguy\u00ean x l\u00e0: <br\/>$\\begin{align*}&(-4) + (-3) + (-2) + (-1) + 0 + 1 + 2 +3 + 4 \\\\&= [(-4) + 4] + [(-3) + 3] + [(-2) + 2] + [(-1) + 1] + 0\\\\& = 0 + 0 + 0 + 0 + 0\\\\&= 0\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0:<span class='basic_pink'>B. 0<\/span><\/span> <br\/>","column":2}]}],"id_ques":1363},{"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 t\u1ed5ng c\u1ee7a c\u00e1c s\u1ed1 nguy\u00ean x, bi\u1ebft: -8 < x < -2. T\u1ed5ng l\u00e0:","select":["A. -25","B. 25","C. -33","D. 33"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ecm c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a x th\u1ecfa m\u00e3n -8 < x < -2<br\/>B\u01b0\u1edbc 2: T\u00ednh t\u1ed5ng c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a x v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> -8 < x < -2 n\u00ean x $\\in$ {-7; -6; -5; -4; -3 }<br\/>T\u1ed5ng c\u00e1c s\u1ed1 nguy\u00ean x l\u00e0: <br\/>$\\begin{align*}&(-7) + (-6) + (-5) + (-4) + (-3) \\\\&= - 7 - 6 - 5 - 4 - 3\\\\& = -(7 + 6 + 5 + 4 + 3)\\\\&= -25\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0:<span class='basic_pink'>A. -25<\/span><\/span> <br\/>","column":2}]}],"id_ques":1364},{"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":[[["50","+50"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai28/lv2/img\/5.jpg' \/><\/center>B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh:<br\/>(15 + 37) + (52 - 37 - 17) = _input_","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: <br\/>$\\begin{align*}&(15 + 37) + (52 - 37 - 17) \\\\&= 15 + 37 + 52 - 37 - 17 \\\\&= (37 - 37) + (52 + 15) - 17\\\\&= 0 + 67 - 17\\\\&= 67 - 17\\\\&= 50\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 50<\/span><\/span> <br\/> "}]}],"id_ques":1365},{"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":[[["29","+29"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai28/lv2/img\/4.jpg' \/><\/center>B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh:<br\/>(38 - 42 + 14) - (38 - 42 - 15) = _input_","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: <br\/>$\\begin{align*}&(38 - 42 + 14) - (38 - 42 - 15) \\\\&= 38 - 42 + 14 - 38 + 42 + 15 \\\\&= (38 - 38) + (42 - 42) + (14 + 15)\\\\&= 0 + 0 + 29\\\\&= 29\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 29<\/span><\/span> <br\/> "}]}],"id_ques":1366},{"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\/>416 + (x - 45) = 387","select":["A. x = 16","B. x = -16","C. x = 74","D. x = -74"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Ta c\u00f3 th\u1ec3 l\u00e0m nh\u01b0 sau:<br\/>B\u01b0\u1edbc 1: T\u00ecm x - 45<br\/>B\u01b0\u1edbc 2: T\u00ecm x<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}416 + (x - 45) &= 387 \\\\x - 45&= 387 - 416\\\\x - 45& = -( 416 - 387)\\\\x - 45&= -29\\\\x&= -29 + 45\\\\x&= 16\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0:<span class='basic_pink'>A. x = 16<\/span><\/span> <br\/>","column":2}]}],"id_ques":1367},{"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\u00ecm x, bi\u1ebft:<br\/>18 + x - 35 = -90","select":["A. x = 107","B. x = 73","C. x = -73","D. x = -107"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thu g\u1ecdn v\u1ebf tr\u00e1i<br\/>B\u01b0\u1edbc 2: T\u00ecm x<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}18 + x - 35 &= -90 \\\\x - (35 - 18)&= -90\\\\x - 17& = -90\\\\x &= -90 + 17\\\\x&= -(90 - 17)\\\\x&= -73\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0:<span class='basic_pink'> C. x = -73<\/span><\/span> <br\/>","column":2}]}],"id_ques":1368},{"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\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a - 1| + 1 = 5","select":["A. a = -5","B. a = 3","C. a = 5 ho\u1eb7c a = -3","D. a = 5 ho\u1eb7c a = 3"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<br\/>N\u00ean:<b> |x| = a (a $\\in$ N) th\u00ec x = a ho\u1eb7c x = -a<\/b><\/span> <br\/><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}|a - 1| + 1&= 5\\\\|a - 1|&= 5 - 1 \\\\|a - 1|&= 4\\end{align*}$<br\/>$\\Rightarrow$ a - 1 = 4 ho\u1eb7c a - 1 = -4<br\/>+) <br\/>$\\begin{align*}a - 1 &= 4\\\\a&= 4 + 1 \\\\a&= 5\\end{align*}$<br\/>+) <br\/>$\\begin{align*}a - 1 &= -4\\\\a&= -4 + 1 \\\\a&= - (4 - 1)\\\\a&= -3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 5 ho\u1eb7c a = -3<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1369},{"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 s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|2a - 5| = 13","select":["A. a = -4 ho\u1eb7c a = 9","B. a = 4 ho\u1eb7c a = -9","C. a = -8 ho\u1eb7c a = 18","D. a = 8 ho\u1eb7c a = -18"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<br\/>N\u00ean:<b> |x| = a (a $\\in$ N) th\u00ec x = a ho\u1eb7c x = -a<\/b><\/span> <br\/><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>|2a - 5| = 13 n\u00ean 2a - 5 = 13 ho\u1eb7c 2a - 5 = -13<br\/>+) <br\/>$\\begin{align*}2a - 5 &= 13\\\\2a&= 13 + 5 \\\\2a&= 18\\\\a&= 18 : 2\\\\a&= 9\\end{align*}$<br\/>+) <br\/>$\\begin{align*}2a - 5 &= -13\\\\2a&= -13 + 5 \\\\2a&= - (13 - 5)\\\\2a&= -8\\end{align*}$<br\/>L\u1ea1i c\u00f3 2 . (-4) = -8<br\/>$\\Rightarrow$ a = -4<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. a = -4 ho\u1eb7c a = 9<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1370},{"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\u00ednh b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd:<br\/>33 . (17 - 5) - 17 . (33 - 5) = <span class='basic_hoi_black'>?<\/span>","select":["A. 80","B. -80","C. -90","D. 90"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p<\/span><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&33 . (17 - 5) - 17 . (33 - 5)\\\\&= 33 . 17 - 33 . 5 - 17 . 33 + 17 . 5 \\\\&= (33 . 17 - 17 . 33) + (17 . 5 - 33 . 5)\\\\&= 0 + 5 . (17 - 33)\\\\&= 5 . [-(33 - 17)]\\\\&= 5 . (-16)\\\\&= -80\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. -80<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1371},{"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 b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd:<br\/>54 - 6 . (17 + 9) = <span class='basic_hoi_black'>?<\/span>","select":["A. 112","B. -112","C. -102","D. 102"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c r\u1ed3i t\u00ednh m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd<\/span><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&54 - 6 . (17 + 9)\\\\&= 54 - 6 . 17 - 6 . 9 \\\\&= 54 - 102 - 54\\\\&= -102 + (54 - 54)\\\\&= -102 + 0\\\\&= -102\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. -102<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1372},{"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 $\\in$ Z, bi\u1ebft: 10 $\\vdots$ x v\u00e0 16 $\\vdots$ x","select":["A. x $\\in$ {-1; 1}","B. x $\\in$ {-2; -1; 1; 2}","C. x $\\in$ {-1; 1 ; 2}","D. x $\\in$ {1; 2}"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> 10 $\\vdots$ x v\u00e0 16 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01afC(10, 16)<\/span><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>10 $\\vdots$ x v\u00e0 16 $\\vdots$ x <br\/>$\\Rightarrow$ x $\\in$ \u01afC(10, 16)<br\/>\u01af(10) = {-10; -5; -2; -1; 1; 2; 5; 10}<br\/>\u01af(16) = {-16; -8; -4; -2; -1; 1; 2; 4; 8; 16}<br\/>V\u1eady: \u01afC(10, 16) = {-2; -1; 1; 2}<br\/>Hay x $\\in$ {-2; -1; 1; 2}<br\/>Ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. x $\\in$ {-2; -1; 1; 2}<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1373},{"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 $\\in$ Z, bi\u1ebft: 4 $\\vdots$ x v\u00e0 12 $\\vdots$ x","select":["A. x $\\in$ {-4; -2; -1; 1; 2; 4}","B. x $\\in$ {-4; -2; -1; 1; 2; 4; 6}","C. x $\\in$ {-6; -4; -2; -1; 1; 2; 4; 6}","x $\\in$ {-2; -1; 1; 2; 4}"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> 4 $\\vdots$ x v\u00e0 12 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01afC(4, 12)<\/span><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>4 $\\vdots$ x v\u00e0 12 $\\vdots$ x <br\/>$\\Rightarrow$ x $\\in$ \u01afC(4, 12)<br\/> L\u1ea1i c\u00f3: 12 $\\vdots$ 4$\\Rightarrow$\u01afC (4, 12) = \u01af (4)<br\/>\u01af(4) = {-4; -2; -1; 1; 2; 4}<br\/>V\u1eady: \u01afC(4, 12) = {-4; -2; -1; 1; 2; 4}<br\/>Hay x $\\in$ {-4; -2; -1; 1; 2; 4}<br\/>Ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. {-4; -2; -1; 1; 2; 4}<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1374},{"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":" (-12).(-13) + 13. (-29) = <span class='basic_hoi_black'>?<\/span>","select":["A. 221","B. -221","C. -533","D. 533"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110\u01b0a bi\u1ec3u th\u1ee9c v\u1ec1 d\u1ea1ng a.c + b. c \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u00ednh nhanh.<\/span> <br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-12).(-13) + 13. (-29)\\\\&= 12. 13 + (-29) . 13\\\\&= [12 + (-29)] . 13\\\\&= [-(29 - 12)]. 13\\\\&= (-17) . 13\\\\&= -221\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. -221<\/span><\/span> <br\/><\/span><span class='basic_left'><b>Nh\u1eadn x\u00e9t:<\/b> <i>(-a) . (-b) = a . b<\/i><\/span>","column":2}]}],"id_ques":1375},{"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":" 18 . 12 + (-24) . 6 = <span class='basic_hoi_black'>?<\/span>","select":["A. 62","B. -62","C. 72","D. -72"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Bi\u1ec3u th\u1ee9c c\u00f3 ch\u1ee9a ph\u00e9p t\u00ednh nh\u00e2n v\u00e0 ph\u00e9p t\u00ednh c\u1ed9ng n\u00ean ta th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p nh\u00e2n tr\u01b0\u1edbc, th\u1ef1c hi\u1ec7n t\u00ednh ph\u00e9p c\u1ed9ng sau.<\/span> <br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&18 . 12 + (-24) . 6\\\\&= 216 + (-144)\\\\&= 216 - 144\\\\&= 72\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 72<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1376},{"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\u00edch 13 . (-24) . (-15) . (-8) . 4 c\u00f3 d\u1ea5u l\u00e0:","select":["+","-"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/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> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>$\\begin{align*}&13 . (-24) . (-15) . (-8) . 4\\\\&= (13 . 4) . [(-24) . (-15) . (-8)] \\\\&= (13 . 4) . [-(24 . 15 . 8)]\\\\&= (+) . (-)\\\\&= (-)\\end{align*}$<br\/>V\u1eady t\u00edch 13 . (-24) . (-15) . (-8) . 4 c\u00f3 d\u1ea5u l\u00e0: (-)<br\/>Ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> -<\/span><\/span> <br\/>","column":2}]}],"id_ques":1377},{"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\u00edch (-2) . (-3) . |-4| . (-5) . 11 c\u00f3 d\u1ea5u l\u00e0:","select":["+","-"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/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> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>$\\begin{align*}&(-2) . (-3) . |-4| . (-5) . 11\\\\&= (-2) . (-3) . 4 . (-5) . 11 \\\\&= (11. 4) . [(-2) . (-3) . (-5)]\\\\&=(11 . 4) . [-(2. 3. 5)]\\\\&= (+) . (-)\\\\&= (-)\\end{align*}$<br\/>V\u1eady t\u00edch 13 . (-24) . (-15) . (-8) . 4 c\u00f3 d\u1ea5u l\u00e0: (-)<br\/>Ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> -<\/span><\/span> <br\/>","column":2}]}],"id_ques":1378},{"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":" (-12) . (-10) <span class='basic_hoi_black'>?<\/span> 15 . 8","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 \u0111\u00f3 v\u1edbi nhau<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\/>Ta c\u00f3:<br\/> $\\underbrace{(-12) . (-10)}_{120} $ <span class='basic_hoi_black'>?<\/span> $\\underbrace{15 . 8}_{120} $<br\/>N\u00ean (-12) . (-10) = 15 . 8<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> =<\/span><\/span> <br\/> ","column":3}]}],"id_ques":1379},{"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":" (-17) . 4 <span class='basic_hoi_black'>?<\/span> 12 . (-6)","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 \u0111\u00f3 v\u1edbi nhau<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\/>Ta c\u00f3:<br\/> $\\underbrace{(-17) . 4}_{-68} $ <span class='basic_hoi_black'>?<\/span> $\\underbrace{12 . (-6)}_{-72} $<br\/> M\u00e0 -68 > -72<br\/>N\u00ean (-17) . 4 > 12 . (-6)<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> ><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1380}],"lesson":{"save":0,"level":2}}