{"segment":[{"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'> Trong bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 c\u00f3: <\/span>","select":["A. C\u00e1c ph\u00e9p to\u00e1n c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia","B. C\u00f3 ph\u00e9p to\u00e1n n\u00e2ng l\u00ean l\u0169y th\u1eeba","C. C\u00f3 c\u00e1c ch\u1eef (\u0111\u1ea1i di\u1ec7n cho c\u00e1c s\u1ed1)","D. C\u00e1c \u0111\u00e1p \u00e1n A, B, C \u0111\u1ec1u \u0111\u00fang"],"explain":"<span class='basic_left'> Trong bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 c\u00f3 c\u00e1c ph\u00e9p to\u00e1n c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia, n\u00e2ng l\u00ean l\u0169y th\u1eeba, ngo\u00e0i ra c\u00f2n c\u00f3 c\u00e1c ch\u1eef (\u0111\u1ea1i di\u1ec7n cho c\u00e1c s\u1ed1). <br\/> C\u00e1c \u0111\u00e1p \u00e1n A, B, C \u0111\u1ec1u \u0111\u00fang. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":2}]}],"id_ques":1051},{"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'> Trong bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1, c\u00e1c ch\u1eef c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho nh\u1eefng s\u1ed1 t\u00f9y \u00fd n\u00e0o \u0111\u00f3. Ng\u01b0\u1eddi ta g\u1ecdi nh\u1eefng ch\u1eef nh\u01b0 v\u1eady l\u00e0 <i> bi\u1ebfn s\u1ed1<\/i><\/span>","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'> Kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 \u0111\u00fang (s\u00e1ch gi\u00e1o khoa l\u1edbp $7$ trang $25$) <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 \u0110\u00fang.<\/span><\/span>","column":2}]}],"id_ques":1052},{"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":[[["abc","acb","bac","bca","cab","cba"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <i>Vi\u1ebft bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 di\u1ec5n \u0111\u1ea1t \u00fd sau: <\/i> T\u00edch c\u1ee7a ba s\u1ed1 $a,b$ v\u00e0 $c.$ <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> _input_ <\/span>","explain":"<span class='basic_left'> T\u00edch c\u1ee7a ba s\u1ed1 $a,b$ v\u00e0 $c$ vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 l\u00e0: $abc$<br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $abc$.<\/span><\/span>"}]}],"id_ques":1053},{"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'> <i>Bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 n\u00e0o sau \u0111\u00e2y bi\u1ec3u th\u1ecb di\u1ec5n \u0111\u1ea1t: <\/i> T\u1ed5ng c\u1ee7a t\u00edch hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi $c.$ <\/span>","select":["A. $(a+b)c$","B. $a(b+c)$","C. $ab+c$","D. $a+b+c$"],"explain":"<span class='basic_left'>T\u1ed5ng c\u1ee7a t\u00edch hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi $c$ vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 l\u00e0: $ab+c$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1054},{"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'> <i>Bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 n\u00e0o sau \u0111\u00e2y bi\u1ec3u th\u1ecb di\u1ec5n \u0111\u1ea1t: <\/i> T\u00edch c\u1ee7a $x$ v\u00e0 $y$ l\u1eadp ph\u01b0\u01a1ng. <\/span>","select":["A. $xy^3$","B. $(x+y)^3$","C. $(xy)^3$","D. $x^3y$"],"explain":"<span class='basic_left'>T\u00edch c\u1ee7a $x$ v\u00e0 $y$ l\u1eadp ph\u01b0\u01a1ng vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 l\u00e0: $xy^3$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}],"id_ques":1055},{"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'> Bi\u1ec3u th\u1ee9c $(a+b)(a-b)$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: <\/span>","select":["A. T\u00edch c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi hi\u1ec7u c\u1ee7a ch\u00fang","B. T\u1ed5ng c\u1ee7a hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi hi\u1ec7u c\u1ee7a ch\u00fang","C. Th\u01b0\u01a1ng c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi hi\u1ec7u c\u1ee7a ch\u00fang","D. Hi\u1ec7u c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi hi\u1ec7u c\u1ee7a ch\u00fang "],"explain":"<span class='basic_left'>Bi\u1ec3u th\u1ee9c $(a+b)(a-b)$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: T\u00edch c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$ v\u1edbi hi\u1ec7u c\u1ee7a ch\u00fang <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":1}]}],"id_ques":1056},{"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'> Bi\u1ec3u th\u1ee9c $(x-y)^2$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: <\/span>","select":["A. Hi\u1ec7u c\u1ee7a $x$ v\u1edbi $y$ b\u00ecnh ph\u01b0\u01a1ng","B. T\u00edch c\u1ee7a hai s\u1ed1 $x$ v\u00e0 $y$ b\u00ecnh ph\u01b0\u01a1ng","C. B\u00ecnh ph\u01b0\u01a1ng t\u1ed5ng hai s\u1ed1 $x$ v\u00e0 $y$","D. B\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u hai s\u1ed1 $x$ v\u00e0 $y$ "],"explain":"<span class='basic_left'>Bi\u1ec3u th\u1ee9c $(x-y)^2$ di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: B\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u hai s\u1ed1 $x$ v\u00e0 $y$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":1}]}],"id_ques":1057},{"time":24,"part":[{"title":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","title_trans":"N\u1ed1i bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 v\u1edbi l\u1eddi di\u1ec5n \u0111\u1ea1t c\u1ee7a n\u00f3 v\u1edbi nhau","audio":"","temp":"matching","correct":[["3","1","2"]],"list":[{"point":5,"image":"","left":["$(a+b)^3$","$a^3+b$","$a^3+b^3$"],"right":["T\u1ed5ng c\u1ee7a $a$ l\u1eadp ph\u01b0\u01a1ng v\u00e0 $b$","T\u1ed5ng c\u00e1c l\u1eadp ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$ ","L\u1eadp ph\u01b0\u01a1ng c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$"],"top":100,"hint":"","explain":" <span class='basic_left'> Bi\u1ec3u th\u1ee9c $(a+b)^3$ \u0111i\u1ec5n \u0111\u1ea1t l\u00e0: L\u1eadp ph\u01b0\u01a1ng c\u1ee7a t\u1ed5ng hai s\u1ed1 $a$ v\u00e0 $b$ <br\/> Bi\u1ec3u th\u1ee9c $(a^3+b)$ \u0111i\u1ec5n \u0111\u1ea1t l\u00e0: T\u1ed5ng c\u1ee7a $a$ l\u1eadp ph\u01b0\u01a1ng v\u00e0 $b$ <br\/> Bi\u1ec3u th\u1ee9c $a^3+b^3$ di\u1ec5n \u0111\u1ea1t l\u00e0: T\u1ed5ng c\u00e1c l\u1eadp ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$ <\/span> "}]}],"id_ques":1058},{"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":[[["13"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $A=2x^2-5x-5$ t\u1ea1i $x=-2$ <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> _input_ <\/span>","hint":" Thay gi\u00e1 tr\u1ecb c\u1ee7a $x$ v\u00e0o bi\u1ec3u th\u1ee9c $A$ \u0111\u1ec3 t\u00ednh","explain":"<span class='basic_left'> Thay $x=-2$ v\u00e0o bi\u1ec3u th\u1ee9c $A$ \u0111\u00e3 cho, ta \u0111\u01b0\u1ee3c: <br\/> $A=2.(-2)^2-5.(-2)-5=13$ <br\/> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $A=2x^2-5x-5$ t\u1ea1i $x=-2$ l\u00e0 $13$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $13$<\/span><\/span>"}]}],"id_ques":1059},{"time":24,"part":[{"title":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","title_trans":"N\u1ed1i bi\u1ec3u th\u1ee9c \u0111\u1ea1i s\u1ed1 v\u1edbi l\u1eddi di\u1ec5n \u0111\u1ea1t c\u1ee7a n\u00f3 v\u1edbi nhau","audio":"","temp":"matching","correct":[["1","3","2"]],"list":[{"point":5,"image":"","left":["B\u00ecnh ph\u01b0\u01a1ng c\u1ee7a hi\u1ec7u $a$ v\u00e0 $b$","Hi\u1ec7u c\u00e1c b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$","Hi\u1ec7u c\u1ee7a $a$ b\u00ecnh ph\u01b0\u01a1ng v\u00e0 $b$ l\u1eadp ph\u01b0\u01a1ng"],"right":["$(a-b)^2$","$a^2-b^3$ ","$a^2-b^2$"],"top":100,"hint":"","explain":" <span class='basic_left'> B\u00ecnh ph\u01b0\u01a1ng c\u1ee7a hi\u1ec7u $a$ v\u00e0 $b$ vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c l\u00e0: $(a-b)^2$ <br\/> Hi\u1ec7u c\u00e1c b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a $a$ v\u00e0 $b$ vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c l\u00e0: $a^2-b^2$ <br\/> Hi\u1ec7u c\u1ee7a $a$ b\u00ecnh ph\u01b0\u01a1ng v\u00e0 $b$ l\u1eadp ph\u01b0\u01a1ng vi\u1ebft th\u00e0nh bi\u1ec3u th\u1ee9c l\u00e0: $a^2-b^3$ <\/span> "}]}],"id_ques":1060},{"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":[[["21"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> T\u00ednh gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c $B=x-6y-6$ t\u1ea1i $x=3;y=-4$ <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> _input_ <\/span>","hint":" Thay gi\u00e1 tr\u1ecb c\u1ee7a $x$ v\u00e0 $y$ v\u00e0o bi\u1ec3u th\u1ee9c $B$ r\u1ed3i t\u00ednh","explain":"<span class='basic_left'> Thay $x=3;y=-4$ v\u00e0o bi\u1ec3u th\u1ee9c $B$ \u0111\u00e3 cho, ta \u0111\u01b0\u1ee3c: <br\/> $B=3-6.(-4)-6=21$ <br\/> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $B=x-6y-6$ t\u1ea1i $x=3;y=-4$ l\u00e0 $21$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $21$<\/span><\/span>"}]}],"id_ques":1061},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","f","f","f"]],"list":[{"point":5,"image":"","col_name":["Kh\u1eb3ng \u0111\u1ecbnh","\u0110\u00fang","Sai"],"arr_ques":[" $x+y+z=(x+y)+z$ ","$x-(y+z)=x-y+z$","$x-(2x-3x)=0$","$x-(y-z)=(x-z)-y$"],"hint":"","explain":[" \u0110\u00fang"," <br\/> Sai, v\u00ec $x-(y+z)=x-y-z$ ","<br\/> Sai, v\u00ec $x-(2x-3x)=2x$","<br\/> Sai, v\u00ec $x-(y-z)=x-y+z=(x+z)-y$"]}]}],"id_ques":1062},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","t","t","f"]],"list":[{"point":5,"image":"","col_name":["Kh\u1eb3ng \u0111\u1ecbnh","\u0110\u00fang","Sai"],"arr_ques":[" $2$ l\u1ea7n $x$ tr\u1eeb \u0111i $10$ \u0111\u01b0\u1ee3c vi\u1ebft th\u00e0nh l\u00e0 $2x-10$ ","$25$ tr\u1eeb \u0111i $4$ l\u1ea7n $n$ \u0111\u01b0\u1ee3c vi\u1ebft th\u00e0nh l\u00e0 $25-4n$","$100$ tr\u1eeb \u0111i hai l\u1ea7n c\u1ee7a t\u1ed5ng $x$ v\u00e0 $5$ \u0111\u01b0\u1ee3c vi\u1ebft th\u00e0nh l\u00e0 $100-2(x+5)$","T\u1ed5ng c\u1ee7a $t$ v\u00e0 $u$ chia cho $9$ \u0111\u01b0\u1ee3c vi\u1ebft th\u00e0nh l\u00e0 $t+\\dfrac{u}{9}$"],"hint":"","explain":[" \u0110\u00fang"," <br\/> \u0110\u00fang ","<br\/> \u0110\u00fang","<br\/> Sai, v\u00ec: T\u1ed5ng c\u1ee7a $t$ v\u00e0 $u$ chia cho $9$ \u0111\u01b0\u1ee3c vi\u1ebft th\u00e0nh l\u00e0 $\\dfrac{t+u}{9}$"]}]}],"id_ques":1063},{"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'> Nam mua $10$ quy\u1ec3n v\u1edf m\u1ed7i quy\u1ec3n gi\u00e1 $x$ \u0111\u1ed3ng v\u00e0 hai c\u00e1i b\u00fat m\u1ed7i chi\u1ebfc gi\u00e1 $y$ \u0111\u1ed3ng. Khi \u0111\u00f3 Nam ph\u1ea3i tr\u1ea3 t\u1ea5t c\u1ea3 s\u1ed1 ti\u1ec1n l\u00e0: <\/span>","select":["A. $10x+y$ (\u0111\u1ed3ng)","B. $x+y$ (\u0111\u1ed3ng)","C. $10x+2y$ (\u0111\u1ed3ng)","D. $2x+10y$ (\u0111\u1ed3ng) "],"explain":"<span class='basic_left'> S\u1ed1 ti\u1ec1n Nam mua h\u1ebft $10$ quy\u1ec3n v\u1edf l\u00e0: $10x$ (\u0111\u1ed3ng) <br\/> S\u1ed1 ti\u1ec1n Nam mua h\u1ebft $2$ c\u00e1i b\u00fat l\u00e0: $2y$ (\u0111\u1ed3ng) <br\/> T\u1ed5ng c\u1ed9ng Nam mua h\u1ebft s\u1ed1 ti\u1ec1n l\u00e0: $10x+2y$ (\u0111\u1ed3ng) <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":2}]}],"id_ques":1064},{"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'> Bi\u1ec3u th\u1ee9c $7a-2b$ \u0111\u01b0\u1ee3c di\u1ec5n \u0111\u1ea1t b\u1eb1ng l\u1eddi l\u00e0: <\/span>","select":["A. Hi\u1ec7u c\u1ee7a t\u00edch hai s\u1ed1 $7$ v\u00e0 $a$ v\u1edbi t\u00edch hai s\u1ed1 $2$ v\u00e0 $b$","B. $7$ l\u1ea7n $a$ tr\u1eeb \u0111i $2$ l\u1ea7n $b$","C. Hi\u1ec7u c\u1ee7a $7$ l\u1ea7n $a$ v\u1edbi $2$ l\u1ea7n $b$","D. C\u1ea3 3 \u0111\u00e1p \u00e1n A, B, C \u0111\u1ec1u \u0111\u00fang "],"explain":"<span class='basic_left'> C\u1ea3 3 c\u00e1ch di\u1ec5n \u0111\u1ea1t trong c\u00e1c \u0111\u00e1p \u00e1n A, B v\u00e0 C \u0111\u1ec1u \u0111\u00fang. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":1}]}],"id_ques":1065},{"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":[[["4"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> \u0110\u1ec3 bi\u1ec3u th\u1ee9c $14x-56$ c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng $0$ th\u00ec gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0 _input_ <\/span>","hint":" Cho bi\u1ec3u th\u1ee9c b\u1eb1ng $0$ r\u1ed3i t\u00ecm $x$","explain":"<span class='basic_left'> Cho bi\u1ec3u th\u1ee9c $14x-56$ b\u1eb1ng $0$ ta c\u00f3: <br\/> $\\begin{align} & 14x-56=0 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,14x=56 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,x=4 \\\\ \\end{align}$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $4$<\/span><\/span>"}]}],"id_ques":1066},{"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_random","correct":[[["4"],["-4"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> \u0110\u1ec3 bi\u1ec3u th\u1ee9c $16-x^2$ c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng $0$ th\u00ec gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0 _input_ ho\u1eb7c _input_ <\/span>","hint":" Cho bi\u1ec3u th\u1ee9c b\u1eb1ng $0$ r\u1ed3i t\u00ecm $x$","explain":"<span class='basic_left'>Cho bi\u1ec3u th\u1ee9c $16-x^2$ b\u1eb1ng $0$ ta c\u00f3: <br\/> $\\begin{aligned} & 16-{{x}^{2}}=0 \\\\ & \\Rightarrow {{x}^{2}}=16 \\\\ & \\,\\,\\,\\Rightarrow \\left[ \\begin{aligned} & x=4 \\\\ & x=-4 \\\\ \\end{aligned} \\right. \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $4$ v\u00e0 $-4$<\/span><\/span>"}]}],"id_ques":1067},{"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'> M\u1ed9t ng\u01b0\u1eddi \u0111i xe m\u00e1y t\u1eeb t\u1ec9nh $A$ t\u1edbi t\u1ec9nh $B$ v\u1edbi v\u1eadn t\u1ed1c $40km\/h$ trong $2$ gi\u1edd. Ng\u01b0\u1eddi \u0111\u00f3 l\u1ea1i ti\u1ebfp t\u1ee5c \u0111i t\u1eeb t\u1ec9nh $B$ t\u1edbi t\u1ec9nh $C$ v\u1edbi v\u1eadn t\u1ed1c $50km\/h$ trong $1$ gi\u1edd. H\u1ecfi t\u1ed5ng c\u1ed9ng ng\u01b0\u1eddi \u0111\u00f3 \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng bao nhi\u00eau $km?$ <\/span>","select":["A. $130km$","B. $120km$","C. $110km$","D. $100km$"],"hint":"Qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c b\u1eb1ng v\u1eadn t\u1ed1c nh\u00e2n v\u1edbi th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3","explain":"<span class='basic_left'> Ng\u01b0\u1eddi \u0111\u00f3 \u0111i t\u1eeb t\u1ec9nh $A$ v\u1edbi t\u1ec9nh $B$ \u0111\u01b0\u1ee3c: $40.2=80\\, (km)$ <br\/> Ng\u01b0\u1eddi \u0111\u00f3 \u0111i t\u1eeb t\u1ec9nh $B$ t\u1edbi t\u1ec9nh $C$ \u0111\u01b0\u1ee3c: $50.1=50\\,(km)$ <br\/>T\u1ed5ng c\u1ed9ng ng\u01b0\u1eddi \u0111\u00f3 \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng l\u00e0: $80+50=130\\,(km)$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":4}]}],"id_ques":1068},{"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":" <span class='basic_left'> \u0110\u1ec3 bi\u1ec3u th\u1ee9c $(5a+7)-19$ c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng $13$ th\u00ec gi\u00e1 tr\u1ecb c\u1ee7a $a$ l\u00e0 _input_ <\/span>","hint":" Cho bi\u1ec3u th\u1ee9c b\u1eb1ng $13$ r\u1ed3i t\u00ecm $a$","explain":"<span class='basic_left'> Cho bi\u1ec3u th\u1ee9c $(5a+7)-19$ b\u1eb1ng $13$ ta c\u00f3: <br\/> $\\begin{align} & \\left( 5a+7 \\right)-19=13 \\\\ & \\,5a+7-19=13 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,5a-12=13 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,5a=13+12 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,5a=25 \\\\ & \\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,\\,a=5 \\\\ \\end{align}$ <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":1069},{"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":[[["-4"],["-5"],["-4"],["-1"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> \u0110i\u1ec1n gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $(x-2)^2-5$ t\u1ea1i c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00e3 cho c\u1ee7a $x$ t\u01b0\u01a1ng \u1ee9ng trong b\u1ea3ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb c\u1ee7a $x$<\/th><th>1<\/th><th>2<\/th><th>3<\/th><th>4<\/th><\/tr><tr><td>$(x-2)^2-5$<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table> <\/span>","explain":"<span class='basic_left'> Thay l\u1ea7n l\u01b0\u1ee3t c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u00e3 cho trong b\u1ea3ng v\u00e0o bi\u1ec3u th\u1ee9c r\u1ed3i t\u00ednh, ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u01b0 sau: <table><tr><th>Gi\u00e1 tr\u1ecb c\u1ee7a $x$<\/th><th>1<\/th><th>2<\/th><th>3<\/th><th>4<\/th><\/tr><tr><td>$(x-2)^2-5$<\/td><td>$(1-2)^2-5=-4$<\/td><td>$(2-2)^2-5=-5$<\/td><td>$(3-2)^2-5=-4$<\/td><td>$(4-2)^2-5=-1$<\/td><\/tr><\/table> <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0: $-4;-5;-4;-1$<\/span><\/span>"}]}],"id_ques":1070}],"lesson":{"save":0,"level":1}}