{"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":" M\u1ed7i \u0111\u01a1n th\u1ee9c \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t \u0111a th\u1ee9c.","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'> Kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 \u0111\u00fang. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 \u0110\u00fang.<\/span><\/span>","column":2}]}],"id_ques":1151},{"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'> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y l\u00e0 <b> \u0111a th\u1ee9c<\/b>? <\/span>","select":["A. $\\dfrac{1}{x+1}$","B. $\\dfrac{x}{y}$","C. $x+y$","D. $2-\\dfrac{1}{x}$"],"hint":"\u0110a th\u1ee9c l\u00e0 m\u1ed9t t\u1ed5ng c\u00e1c \u0111\u01a1n th\u1ee9c. M\u1ed7i \u0111\u01a1n th\u1ee9c trong t\u1ed5ng g\u1ecdi l\u00e0 m\u1ed9t h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c \u0111\u00f3.","explain":"<span class='basic_left'> Bi\u1ec3u th\u1ee9c $x+y$ l\u00e0 \u0111a th\u1ee9c. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1152},{"time":24,"part":[{"title":"Ch\u1ecdn <u>nh\u1eefng<\/u> \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"Ch\u1ecdn \u0111\u01b0\u1ee3c nhi\u1ec1u \u0111\u00e1p \u00e1n","temp":"checkbox","correct":[["1","2","4"]],"list":[{"point":5,"img":"","ques":"Trong c\u00e1c bi\u1ec3u th\u1ee9c sau, nh\u1eefng bi\u1ec3u th\u1ee9c n\u00e0o l\u00e0 \u0111a th\u1ee9c?","hint":"","column":2,"number_true":2,"select":["A. $-2+x^2$","B. $-\\dfrac{11}{2}x^3y^2$","C. $\\dfrac{x+y^2}{2x}$","D. $-x^5y(-9x)$"],"explain":"<span class='basic_left'>Trong c\u00e1c bi\u1ec3u th\u1ee9c tr\u00ean, bi\u1ec3u th\u1ee9c $-2+x^2$; $-\\dfrac{11}{2}x^3y^2$ v\u00e0 bi\u1ec3u th\u1ee9c $-x^5y(-9x)$ l\u00e0 c\u00e1c \u0111a th\u1ee9c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n c\u1ea7n ch\u1ecdn l\u00e0 A;B v\u00e0 D.<\/span><\/span>"}]}],"id_ques":1153},{"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'> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y v\u1eeba l\u00e0 <b> \u0111\u01a1n th\u1ee9c<\/b> v\u1eeba l\u00e0 <b> \u0111a th\u1ee9c <\/b>? <\/span>","select":["A. $x^4+x$","B. $2x+3y$","C. $\\dfrac{x^3}{2}$","D. $xy+y^2$"],"hint":"M\u1ed7i \u0111\u01a1n th\u1ee9c \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t \u0111a th\u1ee9c.","explain":"<span class='basic_left'> C\u00e1c bi\u1ec3u th\u1ee9c $x^4+x$; $2x+3y$ v\u00e0 $xy+y^2$ l\u00e0 c\u00e1c \u0111a th\u1ee9c nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01a1n th\u1ee9c. <br\/> Bi\u1ec3u th\u1ee9c $\\dfrac{x^3}{2}$ l\u00e0 \u0111\u01a1n th\u1ee9c n\u00ean n\u00f3 c\u0169ng l\u00e0 \u0111a th\u1ee9c. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1154},{"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":" \u0110a th\u1ee9c $3x^2-5xy+4y^4$ c\u00f3 s\u1ed1 h\u1ea1ng t\u1eed l\u00e0 _input_ ","explain":"<span class='basic_left'>\u0110a th\u1ee9c $3x^2-5xy+4y^4$ c\u00f3 c\u00e1c h\u1ea1ng t\u1eed l\u00e0: $3x^2;-5xy$ v\u00e0 $4y^4$<br\/> V\u1eady \u0111a th\u1ee9c \u0111\u00e3 cho c\u00f3 $3$ h\u1ea1ng t\u1eed. <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":1155},{"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'> Trong c\u00e1c \u0111a th\u1ee9c sau, \u0111a th\u1ee9c n\u00e0o l\u00e0 <b>\u0111a th\u1ee9c thu g\u1ecdn?<\/b> <\/span>","select":["A. $xy+x^2$","B. $x+3y-5x$","C. $-x^2+2x^2+6$","D. $xy^2-x+4x$"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110a th\u1ee9c kh\u00f4ng c\u00f2n hai h\u1ea1ng t\u1eed n\u00e0o \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta th\u1ea5y: <br\/> $xy+x^2$ kh\u00f4ng c\u00f2n hai h\u1ea1ng t\u1eed n\u00e0o \u0111\u1ed3ng d\u1ea1ng n\u00ean n\u00f3 l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <br\/> $x+3y-5x$ c\u00f3 hai h\u1ea1ng t\u1eed $x$ v\u00e0 $-5x$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau n\u00ean kh\u00f4ng l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <br\/> $-x^2+2x^2+6$ c\u00f3 hai h\u1ea1ng t\u1eed $-x^2$ v\u00e0 $2x^2$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau n\u00ean kh\u00f4ng l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <br\/> $xy^2-x+4x$ c\u00f3 hai h\u1ea1ng t\u1eed $-x$ v\u00e0 $4x$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau n\u00ean kh\u00f4ng l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}],"id_ques":1156},{"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":" <span class='basic_left'> \u0110a th\u1ee9c $(25-x)+(y-1)$ l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <\/span>","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u0110a th\u1ee9c kh\u00f4ng c\u00f2n hai h\u1ea1ng t\u1eed n\u00e0o \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: $(25-x)+(y-1)=25-x+y-1$ c\u00f3 hai h\u1ea1ng t\u1eed $25$ v\u00e0 $-1$ \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau n\u00ean kh\u00f4ng l\u00e0 \u0111a th\u1ee9c thu g\u1ecdn. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 Sai.<\/span> <br\/> <b> L\u01b0u \u00fd: <\/b> C\u00e1c s\u1ed1 th\u1ef1c kh\u00e1c $0$ c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng.<\/span>","column":2}]}],"id_ques":1157},{"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 \u0111a th\u1ee9c $x^2y^2-2xy^2+x^2y-3x^2y^2$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: <\/span>","select":["A. $-2x^2y^2-xy$","B. $-5x^2y^2-2xy^2+x^2y$","C. $5x^2y^2-xy^2$","D. $-2x^2y^2-2xy^2+x^2y$"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m c\u00e1c h\u1ea1ng t\u1eed \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau r\u1ed3i thu g\u1ecdn. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: <br\/>$x^2y^2-2xy^2+x^2y-3x^2y^2$ <br\/> $=(x^2y^2-3x^2y^2)-2xy^2+x^2y$ <br\/> $=-2x^2y^2-2xy^2+x^2y$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1158},{"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'> Thu g\u1ecdn \u0111a th\u1ee9c $15xyz-3x^5+4xyz-y^4+5x^5$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: <\/span>","select":["A. $11xyz-2x^5-y^4$","B. $19xyz+2x^5-y^4$","C. $19xyz-2x^5-y^4$","D. $19xyz+8x^5-y^4$"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Nh\u00f3m c\u00e1c h\u1ea1ng t\u1eed \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau r\u1ed3i thu g\u1ecdn. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: <br\/>$15xyz-3x^5+4xyz-y^4+5x^5$ <br\/> $=(15xyz+4xyz)+(-3x^5+5x^5)-y^4$ <br\/> $=19xyz+2x^5-y^4$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":2}]}],"id_ques":1159},{"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":" B\u1eadc c\u1ee7a \u0111a th\u1ee9c $A=4x^3y+x^2y^2+2xy^4-xy$ l\u00e0 _input_ ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u1eadc c\u1ee7a \u0111a th\u1ee9c l\u00e0 b\u1eadc c\u1ee7a h\u1ea1ng t\u1eed c\u00f3 b\u1eadc cao nh\u1ea5t trong d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c \u0111\u00f3. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta x\u00e9t b\u1eadc c\u1ee7a t\u1eebng h\u1ea1ng t\u1eed trong \u0111a th\u1ee9c $A=4x^3y+x^2y^2+2xy^4-xy$ nh\u01b0 sau: <br\/> - H\u1ea1ng t\u1eed $4x^3y$ c\u00f3 b\u1eadc l\u00e0 $4$ <br\/> - H\u1ea1ng t\u1eed $x^2y^2$ c\u00f3 b\u1eadc l\u00e0 $4$ <br\/> - H\u1ea1ng t\u1eed $2xy^4$ c\u00f3 b\u1eadc l\u00e0 $5$ <br\/> - H\u1ea1ng t\u1eed $-xy$ c\u00f3 b\u1eadc l\u00e0 $2$ <br\/> $\\Rightarrow$ B\u1eadc cao nh\u1ea5t trong c\u00e1c b\u1eadc \u0111\u00f3 l\u00e0 $5$ <br\/> V\u1eady b\u1eadc c\u1ee7a \u0111a th\u1ee9c $A$ 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":1160},{"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":[[["8"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" B\u1eadc c\u1ee7a \u0111a th\u1ee9c $B=100-2x^5+xy^6+7x^8$ l\u00e0 _input_ ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u1eadc c\u1ee7a \u0111a th\u1ee9c l\u00e0 b\u1eadc c\u1ee7a h\u1ea1ng t\u1eed c\u00f3 b\u1eadc cao nh\u1ea5t trong d\u1ea1ng thu g\u1ecdn c\u1ee7a \u0111a th\u1ee9c \u0111\u00f3. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta x\u00e9t b\u1eadc c\u1ee7a t\u1eebng h\u1ea1ng t\u1eed trong \u0111a th\u1ee9c $B=100-2x^5+xy^6+7x^8$ nh\u01b0 sau: <br\/> - H\u1ea1ng t\u1eed $100$ c\u00f3 b\u1eadc l\u00e0 $0$ <br\/> - H\u1ea1ng t\u1eed $-2x^5$ c\u00f3 b\u1eadc l\u00e0 $5$ <br\/> - H\u1ea1ng t\u1eed $xy^6$ c\u00f3 b\u1eadc l\u00e0 $7$ <br\/> - H\u1ea1ng t\u1eed $7x^8$ c\u00f3 b\u1eadc l\u00e0 $8$ <br\/> $\\Rightarrow$ B\u1eadc cao nh\u1ea5t trong c\u00e1c b\u1eadc \u0111\u00f3 l\u00e0 $8$ <br\/> V\u1eady b\u1eadc c\u1ee7a \u0111a th\u1ee9c $B$ l\u00e0 $8$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $8$.<\/span><\/span>"}]}],"id_ques":1161},{"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'> S\u1ed1 $0$ c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111a th\u1ee9c kh\u00f4ng v\u00e0 n\u00f3 kh\u00f4ng c\u00f3 b\u1eadc. <\/span>","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'>Kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 \u0111\u00fang. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 \u0110\u00fang.<\/span> <\/span>","column":2}]}],"id_ques":1162},{"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'> Thu g\u1ecdn \u0111a th\u1ee9c $B$ sau v\u00e0 t\u00ecm b\u1eadc c\u1ee7a n\u00f3: <br\/> $B=5{{x}^{2}}{{y}^{4}}-\\dfrac{1}{2}x{{y}^{3}}+6{{x}^{2}}{{y}^{4}}+\\dfrac{5}{2}x{{y}^{3}}-10x{{y}^{3}}$ <\/span>","select":["A. ${{x}^{2}}{{y}^{4}}-12x{{y}^{3}}$, b\u1eadc c\u1ee7a $B$ l\u00e0 $6$","B. ${{x}^{2}}{{y}^{4}}-12x{{y}^{3}}$, b\u1eadc c\u1ee7a $B$ l\u00e0 $10$","C. $11{{x}^{2}}{{y}^{4}}-8x{{y}^{3}}$, b\u1eadc c\u1ee7a $B$ l\u00e0 $6$","D. $11{{x}^{2}}{{y}^{4}}-8x{{y}^{3}}$, b\u1eadc c\u1ee7a $B$ l\u00e0 $8$"],"explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align} & B=5{{x}^{2}}{{y}^{4}}-\\dfrac{1}{2}x{{y}^{3}}+6{{x}^{2}}{{y}^{4}}+\\dfrac{5}{2}x{{y}^{3}}-10x{{y}^{3}} \\\\ & \\,\\,\\,\\,\\,=\\left( 5{{x}^{2}}{{y}^{4}}+6{{x}^{2}}{{y}^{4}} \\right)+\\left( -\\dfrac{1}{2}x{{y}^{3}}-10x{{y}^{3}}+\\dfrac{5}{2}x{{y}^{3}} \\right) \\\\ & \\,\\,\\,\\,\\,=11{{x}^{2}}{{y}^{4}}-8x{{y}^{3}} \\\\ \\end{align}$ <br\/> B\u1eadc c\u1ee7a \u0111a th\u1ee9c l\u00e0 $6.$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1163},{"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'> Thu g\u1ecdn r\u1ed3i t\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a \u0111a th\u1ee9c $C$ sau t\u1ea1i $x=-2;y=-1$ <br\/> $C=-\\dfrac{5}{2}x{{y}^{2}}+5{{x}^{3}}{{y}^{4}}+6x{{y}^{2}}-\\dfrac{9}{2}x{{y}^{2}}$ <\/span>","select":["A. $-42$","B. $-38$","C. $42$","D. $38$"],"explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align} & C=-\\dfrac{5}{2}x{{y}^{2}}+5{{x}^{3}}{{y}^{4}}+6x{{y}^{2}}-\\dfrac{9}{2}x{{y}^{2}} \\\\ & \\,\\,\\,\\,=\\left( -\\dfrac{5}{2}x{{y}^{2}}-\\dfrac{9}{2}x{{y}^{2}}+6x{{y}^{2}} \\right)+5{{x}^{3}}{{y}^{4}} \\\\ & \\,\\,\\,\\,=-x{{y}^{2}}+5{{x}^{3}}{{y}^{4}} \\\\ \\end{align}$ <br\/> Thay $x=-2;y=-1$ v\u00e0o \u0111a th\u1ee9c $C$ \u0111\u00e3 thu g\u1ecdn ta \u0111\u01b0\u1ee3c: <br\/> $\\begin{align} & C=-\\left( -2 \\right).{{\\left( -1 \\right)}^{2}}+5.{{\\left( -2 \\right)}^{3}}.{{\\left( -1 \\right)}^{4}} \\\\ & \\,\\,\\,\\,=2+5.\\left( -8 \\right).1 \\\\ & \\,\\,\\,\\,=-38 \\\\ \\end{align}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":4}]}],"id_ques":1164},{"time":24,"part":[{"title":"N\u1ed1i b\u1eadc c\u1ee7a \u0111a th\u1ee9c \u1edf c\u1ed9t ph\u1ea3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111a th\u1ee9c \u0111\u00e3 cho \u1edf c\u1ed9t tr\u00e1i","title_trans":"","audio":"","temp":"matching","correct":[["2","3","1","4"]],"list":[{"point":5,"image":"","left":["$x^3+x^2-3x$","$5(xy)^3+7$","$2017$","$xy^3z^3+xyz$"],"right":["$0$","$3$ ","$6$","$7$"],"top":100,"hint":"","explain":" <span class='basic_left'> Ta c\u00f3: <br\/> - \u0110a th\u1ee9c $x^3+x^2-3x$ c\u00f3 b\u1eadc l\u00e0 $3$ <br\/> - \u0110a th\u1ee9c $5(xy)^3+7=5x^3y^3+7$ c\u00f3 b\u1eadc l\u00e0 $6$ <br\/> - \u0110a th\u1ee9c $2017$ c\u00f3 b\u1eadc l\u00e0 $0$ <br\/> - \u0110a th\u1ee9c $xy^3z^3+xyz$ c\u00f3 b\u1eadc l\u00e0 $7$ <\/span> "}]}],"id_ques":1165},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"K\u1ebft qu\u1ea3 thu g\u1ecdn c\u00e1c \u0111a th\u1ee9c \u0111\u00fang hay sai","temp":"true_false","correct":[["t","f","t"]],"list":[{"point":5,"image":"","col_name":["Kh\u1eb3ng \u0111\u1ecbnh","\u0110\u00fang","Sai"],"arr_ques":[" $x^2+2xy-3x^2-7=-2x^2+2xy-7$ ","$x^3-2x+5x^3-5x=6x^3-3x$","$50-4x^2y-25=25-4x^2y$"],"hint":"","explain":[" \u0110\u00fang, v\u00ec $x^2+2xy-3x^2-7=(x^2-3x^2)+2xy-7=-2x^2+2xy-7$"," <br\/> Sai, v\u00ec $x^3-2x+5x^3-5x=(x^3+5x^3)+(-2x-5x)=6x^3-7x$ ","<br\/> \u0110\u00fang, v\u00ec $50-4x^2y-25=(50-25)-4x^2y=25-4x^2y$"]}]}],"id_ques":1166},{"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":" Gi\u00e1 tr\u1ecb c\u1ee7a \u0111a th\u1ee9c $A=5x^3y-4xy^3-5x^3y+1$ t\u1ea1i $x=1;y=-1$ l\u00e0 _input_ ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thu g\u1ecdn \u0111a th\u1ee9c $A$ r\u1ed3i thay gi\u00e1 tr\u1ecb c\u1ee7a $x;y$ v\u00e0o \u0111\u1ec3 t\u00ednh. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $A=5x^3y-4xy^3-5x^3y+1$ <br\/> $=(5x^3y-5x^3y)-4xy^3+1$ <br\/> $=-4xy^3+1$ <br\/> Thay $x=1;y=-1$ v\u00e0o \u0111a th\u1ee9c $A$ \u0111\u00e3 thu g\u1ecdn ta \u0111\u01b0\u1ee3c: <br\/> $A= -4.1.(-1)^3+1=4+1=5$ <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":1167},{"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":[[["259"],["10"]]],"list":[{"point":5,"width":50,"ques":" Gi\u00e1 tr\u1ecb c\u1ee7a \u0111a th\u1ee9c $B=-\\dfrac{4}{5}u{{v}^{2}}+3{{u}^{2}}{{v}^{2}}-\\dfrac{1}{2}{{v}^{2}}+\\dfrac{3}{5}u{{v}^{2}}$ v\u1edbi $u=3;v=-1$ l\u00e0 <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thu g\u1ecdn \u0111a th\u1ee9c $B$ r\u1ed3i thay gi\u00e1 tr\u1ecb c\u1ee7a $u;v$ v\u00e0o \u0111\u1ec3 t\u00ednh. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\begin{align} & B=-\\dfrac{4}{5}u{{v}^{2}}+3{{u}^{2}}{{v}^{2}}-\\dfrac{1}{2}{{v}^{2}}+\\dfrac{3}{5}u{{v}^{2}} \\\\ & \\,\\,\\,\\,\\,=\\left( -\\dfrac{4}{5}u{{v}^{2}}+\\dfrac{3}{5}u{{v}^{2}} \\right)+3{{u}^{2}}{{v}^{2}}-\\dfrac{1}{2}{{v}^{2}} \\\\ & \\,\\,\\,\\,=-\\dfrac{1}{5}u{{v}^{2}}+3{{u}^{2}}{{v}^{2}}-\\dfrac{1}{2}{{v}^{2}} \\\\ \\end{align}$ <br\/> Thay $u=3;v=-1$ v\u00e0o \u0111a th\u1ee9c $B$ \u0111\u00e3 thu g\u1ecdn ta \u0111\u01b0\u1ee3c: <br\/> $\\begin{align} & B=-\\dfrac{1}{5}.3.{{\\left( -1 \\right)}^{2}}+{{3.3}^{2}}.{{\\left( -1 \\right)}^{2}}-\\dfrac{1}{2}.{{\\left( -1 \\right)}^{2}} \\\\ & \\,\\,\\,\\,\\,=-\\dfrac{3}{5}+27-\\dfrac{1}{2} \\\\ & \\,\\,\\,\\,\\,=\\dfrac{259}{10} \\\\ \\end{align}$<\/span>"}]}],"id_ques":1168},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho hai \u0111a th\u1ee9c $A=-4x^5y^3+x^4y^3-6xy^2$ v\u00e0 $B=-3x^4y^3+4x^5y^3$ <br\/> <b> C\u00e2u 1:<\/b> T\u00ednh $A+B.$ <\/span>","select":["A. $A+B=-2{{x}^{4}}{{y}^{3}}-6x{{y}^{2}}$","B. $A+B=4x^4y^3-6xy^2$","C. $A+B=-8x^5y^3-2x^4y^3-6xy^2$","D. $A+B=-8x^5y^3+4x^4y^3-6xy^2$"],"explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align} & A+B=\\left( -4{{x}^{5}}{{y}^{3}}+{{x}^{4}}{{y}^{3}}-6x{{y}^{2}} \\right)+\\left( -3{{x}^{4}}{{y}^{3}}+4{{x}^{5}}{{y}^{3}} \\right) \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=-4{{x}^{5}}{{y}^{3}}+{{x}^{4}}{{y}^{3}}-6x{{y}^{2}}-3{{x}^{4}}{{y}^{3}}+4{{x}^{5}}{{y}^{3}} \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=\\left( -4{{x}^{5}}{{y}^{3}}+4{{x}^{5}}{{y}^{3}} \\right)+\\left( {{x}^{4}}{{y}^{3}}-3{{x}^{4}}{{y}^{3}} \\right)-6x{{y}^{2}} \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=0-2{{x}^{4}}{{y}^{3}}-6x{{y}^{2}} \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=-2{{x}^{4}}{{y}^{3}}-6x{{y}^{2}} \\\\ \\end{align}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}],"id_ques":1169},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho hai \u0111a th\u1ee9c $A=-4x^5y^3+x^4y^3-6xy^2$ v\u00e0 $B=-3x^4y^3+4x^5y^3$ <br\/> <b> C\u00e2u 2:<\/b> T\u00ednh $A-B.$ <\/span>","select":["A. $A-B=4{{x}^{4}}{{y}^{3}}-6x{{y}^{2}}$","B. $A-B=-6xy^2$","C. $A-B=-8x^5y^3-2x^4y^3-6xy^2$","D. $A-B=-8x^5y^3+4x^4y^3-6xy^2$"],"explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align} & A-B=\\left( -4{{x}^{5}}{{y}^{3}}+{{x}^{4}}{{y}^{3}}-6x{{y}^{2}} \\right)-\\left( -3{{x}^{4}}{{y}^{3}}+4{{x}^{5}}{{y}^{3}} \\right) \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=-4{{x}^{5}}{{y}^{3}}+{{x}^{4}}{{y}^{3}}-6x{{y}^{2}}+3{{x}^{4}}{{y}^{3}}-4{{x}^{5}}{{y}^{3}} \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=\\left( -4{{x}^{5}}{{y}^{3}}-4{{x}^{5}}{{y}^{3}} \\right)+\\left( {{x}^{4}}{{y}^{3}}+3{{x}^{4}}{{y}^{3}} \\right)-6x{{y}^{2}} \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,=-8{{x}^{5}}{{y}^{3}}+4{{x}^{4}}{{y}^{3}}-6x{{y}^{2}} \\\\ \\end{align}$. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1170}],"lesson":{"save":0,"level":1}}