{"segment":[{"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\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>106 - x = (-58) - 8","select":["A. x = 156","B. x = -156","C. x = 172","D. x = -172"],"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<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}106 - x &= -58 - 8\\\\106 - x &= - (58 + 8)\\\\106 - x&= -66\\\\x&=106 - (-66)\\\\x&=106 + 66\\\\x&= 172\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. x = 172<\/span><\/span> <br\/>","column":2}]}],"id_ques":1201},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>111 - x = (-78) - 8","select":["A. x = 181","B. x = -181","C. x = -197","D. x = 197"],"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<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}111 - x &= (-78) - 8\\\\111 - x &= - (78 + 8)\\\\111 - x&= -86\\\\x&=111 - (-86)\\\\x&=111 + 86\\\\x&= 197\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. x = 197<\/span><\/span> <br\/>","column":2}]}],"id_ques":1202},{"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\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - 108 = (-47) - 7","select":["A. x = 162","B. x = 54","C. x = -54","D. x = -162"],"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<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - 108 &= (-47) - 7\\\\x - 108 &= - (47 + 7)\\\\x - 108&= -54\\\\x&=-54 + 108\\\\x&=108 - 54\\\\x&= 54\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. x = 54<\/span><\/span> <br\/>","column":2}]}],"id_ques":1203},{"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\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a - 1| = 5","select":["A. a = -6","B. a = 4","C. a = 6 ho\u1eb7c a = -4","D. a = 6 ho\u1eb7c a = 4"],"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\/>|a - 1| = 5 n\u00ean a - 1 = 5 ho\u1eb7c a - 1 = -5<br\/>+) <br\/>$\\begin{align*}a - 1 &= 5\\\\a&= 5 + 1 \\\\a&= 6\\end{align*}$<br\/>+) <br\/>$\\begin{align*}a - 1 &= -5\\\\a&= -5 + 1 \\\\a&= - (5 - 1)\\\\a&= -4\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 6 ho\u1eb7c a = -4<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1204},{"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 s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a + 5| = 4","select":["A. a = 1","B. a = 9","C. a = -1 ho\u1eb7c a = 9","D. a = -1 ho\u1eb7c a = -9"],"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\/>|a + 5| = 4 n\u00ean a + 5 = 4 ho\u1eb7c a + 5 = -4<br\/>+) <br\/>$\\begin{align*}a + 5 &= 4\\\\a&= 4 - 5 \\\\a&= - (5 - 4)\\\\a&= -1\\end{align*}$<br\/>+) <br\/>$\\begin{align*}a + 5 &= -4\\\\a&= -4 - 5\\\\a&= - (4 + 5)\\\\a&= -9\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = -1 ho\u1eb7c a = -9<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1205},{"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\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a - 2| = 2","select":["A. a = 2","B. a = 4","C. a = 4 ho\u1eb7c a = 0","D. a = -4 ho\u1eb7c a = 0"],"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\/>|a - 2| = 2 n\u00ean a - 2 = 2 ho\u1eb7c a - 2 = -2<br\/>+) <br\/>$\\begin{align*}a - 2 &= 2\\\\a&= 2 + 2 \\\\a&= 4\\end{align*}$<br\/>+) <br\/>$\\begin{align*}a -2 &= -2\\\\a&= -2 + 2\\\\a&= 0\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 4 ho\u1eb7c a = 0<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1206},{"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 a, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - (-a) + (a - b) = -b","select":["A. x = 2a","B. x = -2a","C. x = -2a + 2b","D. x = 2a - 2b"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u ( + ) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - (-a) + (a - b) &= -b\\\\x&= -b - (a-b) + (-a) \\\\x&= -b - a + b - a\\\\x&= -(a + a) + (b - b)\\\\x&= -2a + 0\\\\x&= -2a\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>B. x = -2a<\/span><\/span> <br\/>","column":2}]}],"id_ques":1207},{"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, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - [a - (b - a)] = a","select":["A. x = 3a - b","B. x = 3a + b","C. x = 3a","D. x = -3a"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u ( + ) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - [a - (b - a)] &= a\\\\x&= a + [a - (b - a)] \\\\x&= a + (a - b + a)\\\\x&= a + a - b + a\\\\x&= (a + a + a) - b\\\\x&= 3a - b\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A. x = 3a - b<\/span><\/span> <br\/>","column":2}]}],"id_ques":1208},{"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 a, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>(x + a) - (b - a) = -a - (-b)","select":["A. x = 3a - b","B. x = 3a + b","C. x = 3a + 2b","D. x = -3a + 2b"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: B\u1ecf ngo\u1eb7c<br\/>B\u01b0\u1edbc 2: T\u00ecm x<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}(x + a) - (b - a) &= -a - (-b)\\\\x + a - b + a&= -a + b \\\\x + (a + a) - b&= -a + b \\\\x + 2a - b&= -a + b\\\\x&= -a + b + b - 2a\\\\x&= - (a + 2a) + (b + b)\\\\x&= -3a + 2b\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>D. x = -3a + 2b<\/span><\/span> <br\/>","column":2}]}],"id_ques":1209},{"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":"Thu g\u1ecdn bi\u1ec3u th\u1ee9c:<br\/>421 - [(27 + a) - 215] - 9","select":["A. 170 - a","B. a - 170","C. 600 - a","D. a - 600 "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: B\u1ecf ngo\u1eb7c<br\/>B\u01b0\u1edbc 2: Thu g\u1ecdn bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&421 - [(27 + a) - 215] - 9\\\\&= 421 - (27 + a - 215) - 9\\\\&= 421 - 27 - a + 215 - 9 \\\\ &= (421 + 215) - (27 + 9) - a\\\\&= 636 - 36 - a\\\\&= 600 - a\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 600 - a<\/span><\/span> <br\/>","column":2}]}],"id_ques":1210},{"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":"Thu g\u1ecdn bi\u1ec3u th\u1ee9c:<br\/>58 - x + (-214 - 58) - (36 - 214)","select":["A. -x - 36","B. x - 36","C. -x + 36","D. x + 36 "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: B\u1ecf ngo\u1eb7c<br\/>B\u01b0\u1edbc 2: Thu g\u1ecdn bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&58 - x + (-214 - 58) - (36 - 214)\\\\&= 58 - x - 214 - 58 - 36 + 214\\\\&= -x - 36 + (58 - 58) + (214 - 214) \\\\ &= - x - 36 + 0 + 0\\\\&= -x - 36\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. -x - 36<\/span><\/span> <br\/>","column":2}]}],"id_ques":1211},{"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":"Thu g\u1ecdn bi\u1ec3u th\u1ee9c:<br\/>518 - x - (55 - 82) - 45","select":["A. 500 + x","B. 500 - x","C. 700 - x","D. x - 700 "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: B\u1ecf ngo\u1eb7c<br\/>B\u01b0\u1edbc 2: Thu g\u1ecdn bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&518 - x - (55 - 82) - 45\\\\&= 518 - x - 55 + 82 - 45\\\\&= (518 + 82) - (55 + 45) - x \\\\ &= 600 - 100 - x\\\\&= 500 - x\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. 500 - x<\/span><\/span> <br\/>","column":2}]}],"id_ques":1212},{"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":[[["44","+44"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv2/img\/2.jpg' \/><\/center>-[-21 + (38 - _input_)] = 27","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\/>$\\begin{align*}-[-21 + (38 - x)] &= 27\\\\-(-21 + 38 - x) &= 27 \\\\21 - 38 + x&= 27\\\\x&= 27 + 38 - 21\\\\x&= 65 - 21\\\\x&= 44\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 44<\/span><\/span> <br\/> "}]}],"id_ques":1213},{"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":[[["155","+155"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv2/img\/2.jpg' \/><\/center>(36 - _input_ ) - (-71) = -48","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\/>$\\begin{align*}(36 - x) - (-71) &= -48\\\\36 - x + 71 &= -48 \\\\(36 + 71) - x&= -48\\\\107 - x&= -48\\\\x&= 107 - (-48)\\\\x&= 107 + 48\\\\x&= 155\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 155<\/span><\/span> <br\/> "}]}],"id_ques":1214},{"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":[[["34","+34"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv2/img\/2.jpg' \/><\/center>-(27 - _input_) - (-35) = 42","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\/>$\\begin{align*}- (27 - x) - (-35) &= 42\\\\-27 + x + 35 &= 42 \\\\x + (35 - 27)&= 42\\\\x + 8&= 42\\\\x&= 42 - 8\\\\x&= 34\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> 34<\/span><\/span> <br\/> "}]}],"id_ques":1215},{"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<br\/>$A = x - y - 515 - (84 - 15)$ t\u1ea1i $x = 515$; $y = 12$","select":["A. $81$","B. $-81$","C. $111$","D. $-111$ "],"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 $x$ v\u00e0 $y$ v\u00e0o bi\u1ec3u th\u1ee9c $A$<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay $x = 515, y = 12$ v\u00e0o bi\u1ec3u th\u1ee9c $A$ ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}&515 - 12 - 515 - (84 - 15)\\\\&= 515 - 12 - 515 - 84 + 15\\\\&= (515 - 515) - (12 + 84) + 15 \\\\ &= 0 - 96 + 15\\\\&= -96 + 15\\\\&= - (96 - 15)\\\\&= - 81\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. $-81$<\/span><\/span> <br\/>","column":2}]}],"id_ques":1216},{"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<br\/>A = 213 - x - (84 - y) t\u1ea1i x = -99; y = 101","select":["A. 329","B. -329","C. 497","D. -497 "],"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 x v\u00e0 y v\u00e0o bi\u1ec3u th\u1ee9c A<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay x = -99, y = 101 v\u00e0o bi\u1ec3u th\u1ee9c A ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}&213 - (-99) - (84 - 101)\\\\&= 213 + 99 - 84 + 101\\\\&= 213 + (99 + 101)-84\\\\ &= 213 + 200 - 84\\\\&= 413 - 84\\\\& =329\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. 329<\/span><\/span> <br\/>","column":2}]}],"id_ques":1217},{"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<br\/>A = 514 - x - y + 8 t\u1ea1i x = -78; y = 514","select":["A. 70","B. -70","C. 86","D. -86 "],"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 x v\u00e0 y v\u00e0o bi\u1ec3u th\u1ee9c A<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Thay x = -78, y = 514 v\u00e0o bi\u1ec3u th\u1ee9c A ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}&514 - (-78) - 514 + 8\\\\&= 514 + 78 - 514 + 8\\\\&= (514 - 514) + (78 + 8)\\\\ &= 0 + 86\\\\&= 86\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 86<\/span><\/span> <br\/>","column":2}]}],"id_ques":1218},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["f","t","f"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":[" 35 - x = 24 th\u00ec x = 9 "," x - (-5) = 27 th\u00ec x = 22 "," 7 + x = - (-36) th\u00ec x = 42"],"hint":"","explain":["35 - x = 24 th\u00ec x = 9 (Sai). V\u00ec <br\/>$\\begin{align*}35 - x &= 24\\\\x &= 35 - 24 \\\\x&= 11\\end{align*}$ ","<br\/> x - (-5) = 27 th\u00ec x = 22 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}x - (-5) &= 27\\\\x + 5 &= 27 \\\\x&= 27 - 5\\\\x&= 22\\end{align*}$ ","<br\/> 7 + x = - (-36) th\u00ec x = 42 (Sai). V\u00ec<br\/> $\\begin{align*}7 + x &= - (-36)\\\\7 + x &= 36 \\\\x&= 36 - 7\\\\x&= 29\\end{align*}$ "]}]}],"id_ques":1219},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","f","t"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":[" 84 - x = 42 th\u00ec x = 42 "," x + 55 = -45 th\u00ec x = 10 "," x - 12 = 80 th\u00ec x = 92"],"hint":"","explain":["84 - x = 42 th\u00ec x = 42 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}84 - x &= 42\\\\x &= 84 - 42 \\\\x&= 42\\end{align*}$ ","<br\/> x + 55 = -45 th\u00ec x = 10 (Sai). V\u00ec <br\/>$\\begin{align*} x + 55 &= -45\\\\x &= -45 - 55 \\\\x&= -(45 + 55)\\\\x&= -100\\end{align*}$ ","<br\/> x - 12 = 80 th\u00ec x = 92 (\u0110\u00fang). V\u00ec<br\/> $\\begin{align*} x - 12 &= 80\\\\x &= 80 + 12 \\\\x&= 92\\end{align*}$ "]}]}],"id_ques":1220}],"lesson":{"save":0,"level":2}}