Bài tập trung bình bài Nhân hai số nguyên cùng dấu. Nhân hai số nguyên khác dấu. Tính chất của phép nhân

Home Lớp 6 Toán lớp 6 sách cũ Nhân hai số nguyên cùng dấu. Nhân hai số nguyên khác dấu. Tính chất của phép nhân Bài tập trung bình

{"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":[[["-132"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center>11 . (-12) = _input_","hint":" ","explain":"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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>11 . (-12) = - (11 . 12) = -132<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: -132<\/span><\/span> <br\/> "}]}],"id_ques":1251},{"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":[[["-270"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center>18 . (-15) = _input_","hint":" ","explain":"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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>18 . (-15) = - (18 . 15) = -270<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: -270<\/span><\/span> <br\/> "}]}],"id_ques":1252},{"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":[[["121"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center>$(-11)^2$ = _input_","hint":" ","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>$a^2$ = a . a<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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>$(-11)^2$ = (-11) . (-11) = 11 . 11 = 121<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: 121<\/span><\/span> <br\/> "}]}],"id_ques":1253},{"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":" (-14) . (-10) ?<\/span> 7 . 20","select":[" >"," < "," = "],"hint":"","explain":" 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\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-14) . (-10)}_{140} $ ?<\/span> $\\underbrace{7 . 20}_{140} $<br\/>N\u00ean (-14) . (-10) = 7 . 20<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: =<\/span><\/span> <br\/> ","column":3}]}],"id_ques":1254},{"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":" (-41) . (-4) ?<\/span> 6 . 25","select":[" >"," < "," = "],"hint":"","explain":" 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\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-41) . (-4)}_{164} $ ?<\/span> $\\underbrace{6 . 25}_{150} $<br\/> M\u00e0 164 > 150<br\/>N\u00ean (-41) . (-4) > 6 . 25<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: ><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1255},{"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) . 8 ?<\/span> 11 . (-12)","select":[" >"," < "," = "],"hint":"","explain":" 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\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/> $\\underbrace{(-15) . 8}_{-120} $ ?<\/span> $\\underbrace{11 . (-12)}_{-132} $<br\/> M\u00e0 -120 > -132<br\/>N\u00ean (-15) . 8 > 11 . (-12)<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: ><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1256},{"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":[[["-4"],["-4"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center>-5 . _input_ = 20<br\/>5 . _input_ = -20","hint":"","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>(+) . (+) $\\rightarrow$ (+)<br\/>(-) . (-) $\\rightarrow$ (+)<br\/>(-) . (+) $\\rightarrow$ (-)<br\/>(+) . (-) $\\rightarrow$ (-)<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-5) . (-4) = 20<br\/>5 . (-4) = -20<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0: -4; -4<\/span><\/span> <br\/> "}]}],"id_ques":1257},{"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":[[["3"],["-3"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center>-7 . _input_ = -21<br\/>-7 . _input_ = 21","hint":"","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>(+) . (+) $\\rightarrow$ (+)<br\/>(-) . (-) $\\rightarrow$ (+)<br\/>(-) . (+) $\\rightarrow$ (-)<br\/>(+) . (-) $\\rightarrow$ (-)<\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-7) . 3 = -21<br\/>(-7) . (-3) = 21<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0: 3; -3<\/span><\/span> <br\/> "}]}],"id_ques":1258},{"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":[[["13000"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/4.jpg' \/><\/center> (-4) . 13 . (-250) = _input_","hint":"","explain":"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\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-4) . 13 . (-250)\\\\&= 13 . [(-4) . (-250)]\\\\&= 13 . (4 . 250)\\\\&= 13 . 1000\\\\&= 13000\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: 13000<\/span><\/span> <br\/> "}]}],"id_ques":1259},{"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":[[["-3700"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/4.jpg' \/><\/center> (-37) . 84 + 37 . (-16) = _input_","hint":"","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>a . b + a . c = a . (b + c)<br\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-37) . 84 + 37 . (-16)\\\\&= 37 . (-84) + 37 . (-16)\\\\&= 37 . [(-84) + (-16)]\\\\&= 37 . (-100)\\\\&= -(37 . 100)\\\\&= -3700\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: -3700<\/span><\/span> <br\/> "}]}],"id_ques":1260},{"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c:<br\/>A = 2x - 3y v\u1edbi x = -3; y = 5","select":["A = 9","A = -9","A = 21","A = -21"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: Thay gi\u00e1 tr\u1ecb c\u1ee7a x, y v\u00e0o bi\u1ec3u th\u1ee9c<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<br\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -3; y = 5 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&=2. (-3) - 3. 5\\\\&= -(2 . 3) - 15\\\\&= -6 - 15\\\\&= -(6 + 15)\\\\&=-21\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A = -21<\/span><\/span> <br\/>","column":2}]}],"id_ques":1261},{"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 = x . (x + 3) - 5 . x v\u1edbi x = -2","select":["A = 8","A = -8","A = 12","A = -12"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: Thay gi\u00e1 tr\u1ecb c\u1ee7a x v\u00e0o bi\u1ec3u th\u1ee9c<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<br\/>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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -2 v\u00e0o bi\u1ec3u th\u1ee9c ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&=(-2) . (-2 + 3) - 5 . (-2)\\\\&= (-2) . (3 - 2) -[-(5 . 2)]\\\\&= (-2) . 1 - (-10)\\\\&= -2 + 10\\\\&=10 - 2\\\\&= 8\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A = 8<\/span><\/span> <br\/>","column":2}]}],"id_ques":1262},{"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":[[["440"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/4.jpg' \/><\/center> (-5) . 11 . $(-2)^3$ = _input_","hint":"","explain":"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\u1ee3cB\u00e0i gi\u1ea3i:<\/span><br\/> (-5) . 11 . $(-2)^3$<br\/>= -(5 . 11) . $(-2)^3$<br\/>= -55 . (-8)<br\/>= 55 . 8<br\/>= 440<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: 440<\/span><\/span> <br\/> <\/span> "}]}],"id_ques":1263},{"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":[[["-32"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/4.jpg' \/><\/center> $(-2)^5$ = _input_","hint":"","explain":"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 ( - )B\u00e0i gi\u1ea3i:<\/span><br\/> $(-2)^5$<br\/>= (-2) . (-2) . (-2) . (-2) . (-2)<br\/>= -(2 . 2 . 2 . 2 . 2)<br\/>= -32<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: -32<\/span><\/span> <br\/> <\/span> "}]}],"id_ques":1264},{"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":" H\u00e3y ch\u1ecdn ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 nh\u1ecf h\u01a1n 0","select":["A. (-15) . (-7)","B. (-12) . 5","C. 12 . 3","D. (-8) . (-4)"],"hint":"","explain":" 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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-15) . (-7) = 15 . 7 = 105, 105 > 0<\/b><br\/>(-12) . 5 = - (12 . 5) = -60, -60 < 0<\/b><br\/>12 . 3 = 36, 36 > 0<\/b><br\/>(-8) . (-4) = 8 . 4 = 32, 32 > 0<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. (-12) . 5<\/span><\/span> <br\/>","column":2}]}],"id_ques":1265},{"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":" H\u00e3y ch\u1ecdn ph\u00e9p t\u00ednh c\u00f3 k\u1ebft qu\u1ea3 nh\u1ecf h\u01a1n 0","select":["A. (-7) . (-9)","B. (-4) . (-5)","C. 8 . 7","D. (-5) . 4"],"hint":"","explain":" 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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(-7) . (-9) = 7 . 9 = 63, 63 > 0<\/b><br\/>(-4) . (-5) = 4 . 5 = 20, 20 > 0<\/b><br\/>8 . 7 = 56, 56 > 0<\/b><br\/>(-5) . 4 = - (5 . 4) = -20, -20 < 0<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. (-5) . 4<\/span><\/span> <br\/>","column":2}]}],"id_ques":1266},{"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\/>x . (x - 1) = 0","select":["A. x = 0","B. x = 1","C. x = -1","D. x = 0 ho\u1eb7c x = 1"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>A . B = 0 th\u00ec A = 0 ho\u1eb7c B = 0<\/span> <br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>x . (x - 1) = 0<br\/>$\\Rightarrow$ x = 0 ho\u1eb7c x - 1 = 0<br\/>+)<br\/> $\\begin{align*}x - 1&=0\\\\x&= 0 + 1\\\\x&= 1\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. x = 0 ho\u1eb7c x = 1<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1267},{"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\/>(x - 2) . (x - 1) = 0","select":["A. x = -2","B. x = -1","C. x = -1 v\u00e0 x = 2","D. x = 1 ho\u1eb7c x = 2"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>A . B = 0 th\u00ec A = 0 ho\u1eb7c B = 0<\/span> <br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>(x - 2) . (x - 1) = 0<br\/>$\\Rightarrow$ x - 2 = 0 ho\u1eb7c x - 1 = 0<br\/>+)<br\/> $\\begin{align*}x - 2&=0\\\\x&= 0 + 2\\\\x&= 2\\end{align*}$<br\/>+)<br\/> $\\begin{align*}x - 1&=0\\\\x&= 0 + 1\\\\x&= 1\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. x = 1 ho\u1eb7c x = 2<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1268},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai26/lv2/img\/2.jpg' \/><\/center> 2 . (-3) . 9 . 24 = ?<\/span>","select":["A. 1296","B. -1296","C. -1692","D. 1692"],"hint":"","explain":" 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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&2 . (-3) . 9 . 24\\\\&= - (2.3) . 9 . 24\\\\&= -6 . 9 . 24\\\\&=-(6 . 9). 24\\\\&=-54 . 24\\\\&= -(54 . 24)\\\\& = -1296\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. -1296<\/span><\/span> <br\/>","column":2}]}],"id_ques":1269},{"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/lv2/img\/2.jpg' \/><\/center> (-18) . (-6) . 9 . 7 = ?<\/span>","select":["A. 6804","B. -6804","C. -6904","D. 6904"],"hint":"","explain":" 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\/>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&(-18) . (-6) . 9 . 7\\\\&= 18 . 6 . 9 . 7\\\\&= 108 . 9 . 7\\\\&=972 . 7\\\\&=6804\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 6804<\/span><\/span> <br\/>","column":2}]}],"id_ques":1270}],"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

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