{"segment":[{"time":24,"part":[{"title":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00e2y \u0110\u00fang hay Sai","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'> \u0110\u01a1n th\u1ee9c l\u00e0 bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 ch\u1ec9 g\u1ed3m m\u1ed9t s\u1ed1, ho\u1eb7c m\u1ed9t bi\u1ebfn, ho\u1eb7c m\u1ed9t t\u00edch gi\u1eefa c\u00e1c s\u1ed1 v\u00e0 c\u00e1c bi\u1ebfn.<\/span>","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'> Kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 \u0111\u00fang (theo s\u00e1ch gi\u00e1o khoa To\u00e1n $7$) <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 \u0110\u00fang.<\/span><\/span>","column":2}]}],"id_ques":1101},{"time":24,"part":[{"title":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00e2y \u0110\u00fang hay Sai","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" S\u1ed1 $0$ kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01a1n th\u1ee9c.","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'> S\u1ed1 $0$ c\u0169ng l\u00e0 m\u1ed9t \u0111\u01a1n th\u1ee9c. N\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <i> \u0111\u01a1n th\u1ee9c kh\u00f4ng<\/i> <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 Sai.<\/span><\/span>","column":2}]}],"id_ques":1102},{"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":" <span class='basic_left'> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y l\u00e0 <b> \u0111\u01a1n th\u1ee9c<\/b>? <\/span>","select":["A. $x+y$","B. $xy$","C. $x+1$","D. $x^2+y$"],"hint":"\u0110\u01a1n th\u1ee9c l\u00e0 bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 ch\u1ec9 g\u1ed3m m\u1ed9t s\u1ed1, ho\u1eb7c m\u1ed9t bi\u1ebfn, ho\u1eb7c m\u1ed9t t\u00edch gi\u1eefa c\u00e1c s\u1ed1 v\u00e0 c\u00e1c bi\u1ebfn.","explain":"<span class='basic_left'> Trong c\u00e1c \u0111\u00e1p \u00e1n \u0111\u1ec1 b\u00e0i cho th\u00ec ch\u1ec9 c\u00f3 $xy$ \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t \u0111\u01a1n th\u1ee9c. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":2}]}],"id_ques":1103},{"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":" <span class='basic_left'> \u0110\u01a1n th\u1ee9c n\u00e0o trong c\u00e1c \u0111\u01a1n th\u1ee9c sau l\u00e0 <b> \u0111\u01a1n th\u1ee9c thu g\u1ecdn<\/b>?<\/span>","select":["A. $xy^2x$","B. $xyy$","C. $xxy^2$","D. $xy^4$"],"hint":"\u0110\u01a1n th\u1ee9c thu g\u1ecdn l\u00e0 \u0111\u01a1n th\u1ee9c ch\u1ec9 g\u1ed3m t\u00edch c\u1ee7a m\u1ed9t s\u1ed1 v\u1edbi c\u00e1c bi\u1ebfn, m\u00e0 m\u1ed7i bi\u1ebfn \u0111\u00e3 \u0111\u01b0\u1ee3c n\u00e2ng l\u00ean l\u0169y th\u1eeba v\u1edbi s\u1ed1 m\u0169 nguy\u00ean d\u01b0\u01a1ng.","explain":"<span class='basic_left'> Trong c\u00e1c \u0111\u01a1n th\u1ee9c tr\u00ean th\u00ec \u0111\u01a1n th\u1ee9c $xy^4$ l\u00e0 <b> \u0111\u01a1n th\u1ee9c thu g\u1ecdn<\/b> <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1104},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-3"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" H\u1ec7 s\u1ed1 c\u1ee7a \u0111\u01a1n th\u1ee9c $-3xyz$ l\u00e0 _input_ ","explain":"<span class='basic_left'> \u0110\u01a1n th\u1ee9c $-3xyz$ c\u00f3 h\u1ec7 s\u1ed1 l\u00e0 $-3$<br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $-3$.<\/span><\/span>"}]}],"id_ques":1105},{"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":" <span class='basic_left'> Ph\u1ea7n bi\u1ebfn c\u1ee7a \u0111\u01a1n th\u1ee9c $-5x^2y^3$ l\u00e0:<\/span>","select":["A. $xy$","B. $-5$","C. $x^2y^3$"],"explain":"<span class='basic_left'> Ph\u1ea7n bi\u1ebfn c\u1ee7a \u0111\u01a1n th\u1ee9c $-5x^2y^3$ l\u00e0 $x^2y^3$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":3}]}],"id_ques":1106},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" \u0110\u01a1n th\u1ee9c $\\dfrac{1}{3}xyz^3$ c\u00f3 b\u1eadc l\u00e0 _input_ ","explain":"<span class='basic_left'> Trong \u0111\u01a1n th\u1ee9c $\\dfrac{1}{3}xyz^3$, bi\u1ebfn $x$ c\u00f3 s\u1ed1 m\u0169 l\u00e0 $1$, bi\u1ebfn $y$ c\u00f3 s\u1ed1 m\u0169 l\u00e0 $1$, bi\u1ebfn $z$ c\u00f3 s\u1ed1 m\u0169 l\u00e0 $3.$ <br\/> $\\Rightarrow$ T\u1ed5ng s\u1ed1 m\u0169 c\u1ee7a c\u00e1c bi\u1ebfn l\u00e0 $1+1+3=5$ <br\/> Do \u0111\u00f3, b\u1eadc c\u1ee7a \u0111\u01a1n th\u1ee9c $\\dfrac{1}{3}xyz^3$ l\u00e0 $5.$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $5$.<\/span><\/span>"}]}],"id_ques":1107},{"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":" <span class='basic_left'> B\u1eadc c\u1ee7a \u0111\u01a1n th\u1ee9c c\u00f3 h\u1ec7 s\u1ed1 kh\u00e1c $0$ l\u00e0: <\/span>","select":["A. T\u1ed5ng s\u1ed1 m\u0169 c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c bi\u1ebfn c\u00f3 trong \u0111\u01a1n th\u1ee9c \u0111\u00f3","B. T\u1ed5ng s\u1ed1 bi\u1ebfn c\u00f3 trong \u0111\u01a1n th\u1ee9c \u0111\u00f3","C. H\u1ec7 s\u1ed1 c\u1ee7a \u0111\u01a1n th\u1ee9c \u0111\u00f3","D. S\u1ed1 m\u0169 l\u1edbn nh\u1ea5t c\u1ee7a bi\u1ebfn c\u00f3 trong \u0111\u01a1n th\u1ee9c \u0111\u00f3"],"explain":"<span class='basic_left'> B\u1eadc c\u1ee7a \u0111\u01a1n th\u1ee9c c\u00f3 h\u1ec7 s\u1ed1 kh\u00e1c $0$ l\u00e0 t\u1ed5ng s\u1ed1 m\u0169 c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c bi\u1ebfn c\u00f3 trong \u0111\u01a1n th\u1ee9c \u0111\u00f3. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":1}]}],"id_ques":1108},{"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":" <span class='basic_left'> \u0110\u01a1n th\u1ee9c n\u00e0o sau \u0111\u00e2y c\u00f3 b\u1eadc l\u00e0 $4?$ <\/span>","select":["A. $2xy^4$","B. $4x$","C. $\\dfrac{1}{2}x^2y^2$","D. $\\dfrac{2}{3}x^4y$ "],"explain":"<span class='basic_left'> \u0110\u01a1n th\u1ee9c $2xy^4$ c\u00f3 b\u1eadc l\u00e0 $5$ <br\/> \u0110\u01a1n th\u1ee9c $4x$ c\u00f3 b\u1eadc l\u00e0 $1$ <br\/> \u0110\u01a1n th\u1ee9c $\\dfrac{1}{2}x^2y^2$ c\u00f3 b\u1eadc l\u00e0 $4$ <br\/> \u0110\u01a1n th\u1ee9c $\\dfrac{2}{3}x^4y$ c\u00f3 b\u1eadc l\u00e0 $5$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1109},{"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":" <span class='basic_left'> S\u1ed1 $-6$ l\u00e0 m\u1ed9t \u0111\u01a1n th\u1ee9c v\u00e0 c\u00f3 b\u1eadc l\u00e0: <\/span>","select":["A. $0$","B. $1$","C. $6$","D. Kh\u00f4ng c\u00f3 b\u1eadc "],"explain":"<span class='basic_left'> \u0110\u01a1n th\u1ee9c $-6$ c\u00f3 b\u1eadc l\u00e0 $0$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><br\/> <b> L\u01b0u \u00fd:<\/b> <i>S\u1ed1 th\u1ef1c kh\u00e1c $0$ l\u00e0 \u0111\u01a1n th\u1ee9c b\u1eadc kh\u00f4ng. <\/i><\/span>","column":2}]}],"id_ques":1110},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-28"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" Gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u01a1n th\u1ee9c $7a^2b^3$ t\u1ea1i $a=2;b=-1$ l\u00e0 _input_ ","hint":"Thay gi\u00e1 tr\u1ecb c\u1ee7a $a;b$ v\u00e0o \u0111\u01a1n th\u1ee9c r\u1ed3i t\u00ednh.","explain":"<span class='basic_left'> Thay $a=2;b=-1$ v\u00e0o \u0111\u01a1n th\u1ee9c $7a^2b^3$ ta \u0111\u01b0\u1ee3c: <br\/> $7a^2b^3=7.2^2.(-1)^3=7.4.(-1)=-28$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $-28$.<\/span><\/span>"}]}],"id_ques":1111},{"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":" <span class='basic_left'> V\u1edbi $x=-2;y=-3;z=-4$ th\u00ec gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u01a1n th\u1ee9c $-\\dfrac{2}{5}(xyz)^2$ l\u00e0: <\/span>","select":["A. $-\\dfrac{48}{5}$","B. $\\dfrac{48}{5}$","C. $\\dfrac{1152}{5}$","D. $-\\dfrac{1152}{5}$ "],"hint":"Thay gi\u00e1 tr\u1ecb c\u1ee7a $x;y;z$ v\u00e0o \u0111\u01a1n th\u1ee9c r\u1ed3i t\u00ednh.","explain":"<span class='basic_left'> Thay $x=-2;y=-3;z=-4$ v\u00e0o \u0111\u01a1n th\u1ee9c $-\\dfrac{2}{5}(xyz)^2$ ta \u0111\u01b0\u1ee3c: <br\/> $-\\dfrac{2}{5}(xyz)^2=-\\dfrac{2}{5}.[(-2).(-3).(-4)]^2=-\\dfrac{2}{5}.(-24)^2=-\\dfrac{1152}{5}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1112},{"time":24,"part":[{"title":"N\u1ed1i ph\u00e9p nh\u00e2n hai \u0111\u01a1n th\u1ee9c b\u00ean c\u1ed9t tr\u00e1i v\u1edbi k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u1ee9ng b\u00ean c\u1ed9t ph\u1ea3i v\u1edbi nhau","title_trans":"","audio":"","temp":"matching","correct":[["2","3","1"]],"list":[{"point":5,"image":"","left":["$xy.xy^3$","$-y^3.(x^2y)$","$x^2.(-2xy^2)$"],"right":["$-2x^3y^2$","$x^2y^4$ ","$-x^2y^4$"],"top":100,"hint":"","explain":" <span class='basic_left'> Ta c\u00f3: <br\/> $xy.xy^3=(xx)(yy^3)=x^2y^4$ <br\/> $-y^3.(x^2y)=-(x^2)(y^3y)=-x^2y^4$ <br\/> $x^2.(-2xy^2)=[1.(-2)](x^2x)(y^2)=-2x^3y^2$ <br\/><span class='basic_pink'> V\u1eady n\u1ed1i $xy.xy^3$ v\u1edbi $x^2y^4$ <br\/> N\u1ed1i $-y^3.(x^2y)$ v\u1edbi $-x^2y^4$ <br\/> N\u1ed1i $x^2.(-2xy^2)$ v\u1edbi $-2x^3y^2$<\/span> <\/span> "}]}],"id_ques":1113},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"K\u1ebft qu\u1ea3 c\u00e1c ph\u00e9p nh\u00e2n \u0111\u01a1n th\u1ee9c v\u1edbi nhau \u0111\u00fang hay sai","temp":"true_false","correct":[["f","t","f","f"]],"list":[{"point":5,"image":"","col_name":["Kh\u1eb3ng \u0111\u1ecbnh","\u0110\u00fang","Sai"],"arr_ques":[" $a^3b^3.a^2b^2c=a^6b^6c$ ","$5xy.(-2bx^2y)=-10bx^3y^2$","$ab.a^2c.b^2c=a^3b^3c$","$2x.(-4xy).(8x^2y^3)=64x^4y^4$"],"hint":"","explain":[" Sai, v\u00ec $a^3b^3.a^2b^2c=(a^3a^2)(b^3b^2)c=a^5b^5c$"," <br\/> \u0110\u00fang, v\u00ec $5xy.(-2bx^2y)=[5.(-2b)](xx^2)(yy) =-10bx^3y^2$ ","<br\/> Sai, v\u00ec $ab.a^2c.b^2c=(aa^2)(bb^2)(cc) =a^3b^3c^2$","<br\/> Sai, v\u00ec $2x.(-4xy).(8x^2y^3)=[2.(-4).8](xxx^2)(yy^3) =-64x^4y^4$"]}]}],"id_ques":1114},{"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":" <span class='basic_left'> Thu g\u1ecdn \u0111\u01a1n th\u1ee9c $2x^2y(-3x^2y^2)x$ r\u1ed3i t\u00ecm b\u1eadc c\u1ee7a n\u00f3 ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:<\/span>","select":["A. $-6x^4y^3$, b\u1eadc c\u1ee7a n\u00f3 l\u00e0 $7$","B. $6x^3y^3$, b\u1eadc c\u1ee7a n\u00f3 l\u00e0 $6$","C. $-5x^4y^2$, b\u1eadc c\u1ee7a n\u00f3 l\u00e0 $6$","D. $-6x^5y^3$, b\u1eadc c\u1ee7a n\u00f3 l\u00e0 $8$ "],"hint":"","explain":"<span class='basic_left'> Thu g\u1ecdn \u0111\u01a1n th\u1ee9c $2x^2y(-3x^2y^2)x$ ta \u0111\u01b0\u1ee3c: <br\/> $2x^2y(-3x^2y^2)x=[2.(-3)](x^2x^2x)(yy^2)=-6x^5y^3$ <br\/> \u0110\u01a1n th\u1ee9c $-6x^5y^3$ c\u00f3 b\u1eadc l\u00e0 $8.$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1115},{"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":" <span class='basic_left'> C\u1eb7p \u0111\u01a1n th\u1ee9c n\u00e0o sau \u0111\u00e2y \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau?<\/span>","select":["A. $-xy^2$ v\u00e0 $-x^2y$","B. $3xy$ v\u00e0 $\\dfrac{1}{2}xy$","C. $x^2yz$ v\u00e0 $xyz$","D. $5x$ v\u00e0 $6y$ "],"hint":"X\u00e9t xem c\u1eb7p \u0111\u01a1n th\u1ee9c n\u00e0o (h\u1ec7 s\u1ed1 kh\u00e1c $0$) c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn.","explain":"<span class='basic_left'> Ta th\u1ea5y c\u1eb7p \u0111\u01a1n th\u1ee9c $3xy$ v\u00e0 $\\dfrac{1}{2}xy$ \u0111\u1ec1u c\u00f3 h\u1ec7 s\u1ed1 kh\u00e1c $0$ v\u00e0 c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn l\u00e0 $xy$ n\u00ean ch\u00fang \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span> <br\/> <b> L\u01b0u \u00fd: <\/b> <i> Hai \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng l\u00e0 hai \u0111\u01a1n th\u1ee9c c\u00f3 h\u1ec7 s\u1ed1 kh\u00e1c $0$ v\u00e0 c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn. <\/i><\/span>","column":2}]}],"id_ques":1116},{"time":24,"part":[{"title":"N\u1ed1i \u0111\u01a1n th\u1ee9c b\u00ean tr\u00e1i v\u00e0 b\u00ean ph\u1ea3i \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau","title_trans":"","audio":"","temp":"matching","correct":[["3","1","2"]],"list":[{"point":5,"image":"","left":["$a^3bc$","$5ab^2c$","$-6(abc)^2$"],"right":["$2ab^2c$","$a^2b^2c^2$ ","$-6a^3bc$"],"top":100,"hint":"","explain":" <span class='basic_left'> Ta c\u00f3: <br\/> + \u0110\u01a1n th\u1ee9c $a^3bc$ v\u00e0 $-6a^3bc$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau v\u00ec c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn $a^3bc$ <br\/> + \u0110\u01a1n th\u1ee9c $5ab^2c$ v\u00e0 $2ab^2c$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau v\u00ec c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn $ab^2c$ <br\/> + \u0110\u01a1n th\u1ee9c $-6(abc)^2=-6a^2b^2c^2$ v\u00e0 $a^2b^2c^2$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau v\u00ec c\u00f3 c\u00f9ng ph\u1ea7n bi\u1ebfn $a^2b^2c^2$ <br\/><span class='basic_pink'> V\u1eady n\u1ed1i $a^3bc$ v\u1edbi $-6a^3bc$ <br\/> N\u1ed1i $5ab^2c$ v\u1edbi $2ab^2c$ <br\/> N\u1ed1i $-6(abc)^2$ v\u1edbi $a^2b^2c^2$<\/span> <\/span> "}]}],"id_ques":1117},{"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":" <span class='basic_left'> Cho hai \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng: $25a^3b^2c$ v\u00e0 $-5a^3b^2c$ <br\/> T\u1ed5ng c\u1ee7a ch\u00fang l\u00e0:<\/span>","select":["A. $20a^3b^2c$","B. $20a^6b^4c^2$","C. $30a^3b^2c$","D. $30a^6b^4c^2$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110\u1ec3 c\u1ed9ng hai \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng, ta c\u1ed9ng c\u00e1c h\u1ec7 s\u1ed1 v\u1edbi nhau v\u00e0 gi\u1eef nguy\u00ean ph\u1ea7n bi\u1ebfn. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/>$(25a^3b^2c)+(-5a^3b^2c)=[25+(-5)]a^3b^2c=20a^3b^2c$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}],"id_ques":1118},{"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":" <span class='basic_left'> T\u00ednh $-\\dfrac{1}{2}y^2z^3-5y^2z^3$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:<\/span>","select":["A. $-\\dfrac{9}{2}y^2z^3$","B. $-\\dfrac{11}{2}y^2z^3$","C. $-\\dfrac{11}{2}$","D. $-\\dfrac{9}{2}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110\u1ec3 tr\u1eeb hai \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng, ta tr\u1eeb c\u00e1c h\u1ec7 s\u1ed1 v\u1edbi nhau v\u00e0 gi\u1eef nguy\u00ean ph\u1ea7n bi\u1ebfn. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/>$-\\dfrac{1}{2}y^2z^3-5y^2z^3=$$\\left( -\\dfrac{1}{2}-5 \\right){{y}^{2}}{{z}^{3}}=-\\dfrac{11}{2}{{y}^{2}}{{z}^{3}}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":2}]}],"id_ques":1119},{"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":" <span class='basic_left'> T\u00ednh $-3x^2-0,5x^2+2,5x^2$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:<\/span>","select":["A. $0$","B. $-1$","C. $-x^2$","D. $-5x^2$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110\u1ec3 c\u1ed9ng (tr\u1eeb) hai \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng, ta c\u1ed9ng (tr\u1eeb) c\u00e1c h\u1ec7 s\u1ed1 v\u1edbi nhau v\u00e0 gi\u1eef nguy\u00ean ph\u1ea7n bi\u1ebfn. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/>$-3x^2-0,5x^2+2,5x^2=[-3-0,5+2,5]x^2=(-1).x^2 =-x^2$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":4}]}],"id_ques":1120}],"lesson":{"save":0,"level":1}}