{"segment":[{"time":24,"part":[{"title":"","title_trans":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n v\u00e0o \u00f4 tr\u1ed1ng","temp":"fill_the_blank","correct":[[["256"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"T\u00ecm s\u1ed1 $x$ kh\u00f4ng \u00e2m, bi\u1ebft: $2.\\sqrt{x} = 32$<br\/>\u0110\u00e1p s\u1ed1: $x = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$","hint":"V\u1edbi $a \\ne 0$ ta c\u00f3: $a.x=b\\Leftrightarrow x= \\dfrac{b}{a}$","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn<\/span><br\/><b>B\u01b0\u1edbc 1:<\/b> T\u00ednh $\\sqrt{x}$<br\/><b>B\u01b0\u1edbc 2:<\/b>T\u00ecm $x$. (V\u1edbi $a \\ge 0 $, ta c\u00f3: $\\sqrt{x}=a \\Leftrightarrow x=a^2$)<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i: <\/span><br\/>V\u1edbi $x \\ge 0,$ ta c\u00f3:<br\/>$\\begin{align*} &2.\\sqrt{x}=32\\\\ \\Leftrightarrow\\,&\\sqrt{x}=16\\\\ \\Leftrightarrow\\, & x={{16}^{2}}\\\\ \\Leftrightarrow\\,& x=256\\end{align*}$<br\/><\/span><span class='basic_left'><span class='basic_pink'> V\u1eady c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $256$ <\/span><\/span><\/span>"}]}],"id_ques":431},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["64"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"T\u00ecm s\u1ed1 $x$ kh\u00f4ng \u00e2m, bi\u1ebft: $3.\\sqrt{x}= 24$<br\/>\u0110\u00e1p s\u1ed1: $x = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$","hint":"V\u1edbi a $\\ne$ 0 ta c\u00f3 : $a.x=b\\Leftrightarrow x= \\dfrac{b}{a}$","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn<\/span><br\/><b>B\u01b0\u1edbc 1:<\/b> T\u00ecm $\\sqrt{x}$<br\/><b>B\u01b0\u1edbc 2:<\/b> T\u00ecm $x$ (V\u1edbi $a \\ge 0$, ta c\u00f3: $\\sqrt{x}=a \\Leftrightarrow x=a^2$)<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i: <\/span><br\/>Ta c\u00f3: <br\/>$\\begin{align*} &3.\\sqrt{x}=24 \\\\ \\Leftrightarrow\\,&\\sqrt{x}=8\\\\ \\Leftrightarrow \\,&x={{8}^{2}}\\\\ \\Leftrightarrow \\,&x=64\\\\ \\end{align*}$<br\/><\/span><span class='basic_left'><span class='basic_pink'> V\u1eady c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $64$ <\/span><\/span><\/span>"}]}],"id_ques":432},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["144"],["169"]]],"list":[{"point":5,"width":20,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/1.png' \/><\/center>$\\sqrt{\\dfrac{{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}}{{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}}}=\\dfrac{{12}}{{13}}$","hint":"V\u1edbi $a\\ge 0,$ ta c\u00f3 $\\sqrt{{a}^{2}}=a$","explain":"<span class='basic_left'> Ta c\u00f3:<br\/>$\\dfrac{12}{13}=\\sqrt{{{\\left( \\dfrac{12}{13} \\right)}^{2}}}=\\sqrt{\\dfrac{144}{169}}$<br\/><span class='basic_pink'>S\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $\\dfrac{144}{169}$<\/span><\/span> "}]}],"id_ques":433},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["16"],["25"]]],"list":[{"point":5,"width":20,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/1.png' \/><\/center>$\\sqrt{\\dfrac{{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}}{{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}}}=\\dfrac{{4}}{{5}}$","hint":"V\u1edbi $a\\ge 0,$ ta c\u00f3 $\\sqrt{{a}^{2}}=a$","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$\\dfrac{4}{5}=\\sqrt{{{\\left( \\dfrac{4}{5} \\right)}^{2}}}=\\sqrt{\\dfrac{16}{25}}$<br\/><span class='basic_pink'> S\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0$\\dfrac{16}{25}$<\/span> <\/span>"}]}],"id_ques":434},{"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 gi\u00e1 tr\u1ecb c\u1ee7a $x$ kh\u00f4ng \u00e2m \u0111\u1ec3 $\\sqrt{x}<5$ l\u00e0:","select":["A. $x > 25$","B. $x > 5$","C. $0 \\le x < 25 $","D. $x < 25$"],"hint":"Bi\u1ebfn \u0111\u1ed5i \u0111\u1ec3 l\u00e0m m\u1ea5t c\u0103n th\u1ee9c \u1edf v\u1ebf tr\u00e1i ho\u1eb7c \u0111\u01b0a v\u1ebf ph\u1ea3i v\u00e0o c\u0103n th\u1ee9c \u0111\u1ec3 so s\u00e1nh","explain":"<span class='basic_left'>\u0110i\u1ec1u ki\u1ec7n: $x \\ge 0$<br\/>Ta c\u00f3: $\\sqrt{x}<5 \\Leftrightarrow (\\sqrt{x})^2< 5^2\\Leftrightarrow x< 25$<br\/> Do \u0111\u00f3, $0 \\le x < 25 $ <br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C<\/span><br\/><span class='basic_left'><span class='basic_green'>L\u01b0u \u00fd:<\/span><br\/>V\u1edbi hai s\u1ed1 $a$ v\u00e0 $b$ kh\u00f4ng \u00e2m ta c\u00f3: $a < b \\Leftrightarrow \\sqrt{a}<\\sqrt{b}$<\/span> <br\/><br\/><\/span> ","column":2}]}],"id_ques":435},{"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 gi\u00e1 tr\u1ecb c\u1ee7a $x$ kh\u00f4ng \u00e2m \u0111\u1ec3 $\\sqrt{x}<\\sqrt{3}$ l\u00e0:","select":["A. $x < 3$","B. $0 \\le x < 3 $","C. $x > 3$","D. $x = 3$"],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec1u ki\u1ec7n: $x \\ge 0$<br\/>Ta c\u00f3: <br\/>$\\sqrt{x}<\\sqrt{3}\\Leftrightarrow (\\sqrt{x})^2<(\\sqrt{3})^2\\Leftrightarrow x<3$<br\/> Do \u0111\u00f3, $0 \\le x < 3 $ <br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B<\/span> ","column":2}]}],"id_ques":436},{"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":"Gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u1ec3 $2.\\sqrt{x}=30$ l\u00e0:","select":["A. $x= 225$","B. $x= 900$","C. $x= 15$","D. $x= -225$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn<\/span><br\/><b>B\u01b0\u1edbc 1:<\/b> T\u00ednh $\\sqrt{x}$<br\/><b>B\u01b0\u1edbc 2:<\/b> V\u1edbi $a \\ge 0$, ta c\u00f3: $\\sqrt{x}=a \\Leftrightarrow x=a^2$<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i: <\/span><br\/>\u0110i\u1ec1u ki\u1ec7n: $x \\ge 0.$<br\/>Ta c\u00f3:<br\/>$\\begin{align*}&2\\sqrt{x}=30 \\\\ \\Leftrightarrow\\,&\\sqrt{x}=15\\\\ \\Leftrightarrow \\,&x={{15}^{2}}\\\\ \\Leftrightarrow \\,&x=225\\\\ \\end{align*}$<br\/><\/span><span class='basic_left'><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A <\/span><\/span>","column":2}]}],"id_ques":437},{"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":"Gi\u00e1 tr\u1ecb c\u1ee7a $x$ \u0111\u1ec3 $5.\\sqrt{x}=70$ l\u00e0:","select":["A. $x= 980$","B. $x= 14$","C. $x=-196$","D. $x= 196$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn<\/span><br\/><b>B\u01b0\u1edbc 1:<\/b> T\u00ednh $\\sqrt{x}$<br\/><b>B\u01b0\u1edbc 2:<\/b>T\u00ecm $x$ (V\u1edbi $a \\ge 0$, ta c\u00f3: $\\sqrt{x}=a \\Leftrightarrow x=a^2$)<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i: <\/span><br\/>V\u1edbi $x \\ge 0,$ ta c\u00f3: <br\/>$\\begin{align*}&5\\sqrt{x}=70\\\\ \\Leftrightarrow\\,&\\sqrt{x}=14\\\\ \\Leftrightarrow \\,&x={{14}^{2}}\\\\ \\Leftrightarrow \\,&x=196\\\\ \\end{align*}$<br\/><\/span><span class='basic_left'><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D <\/span><\/span>","column":2}]}],"id_ques":438},{"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":"C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ${{\\left( a-3 \\right)}^{2}}$ l\u00e0:","select":["A. $a - 3$","B. $3 - a$","C. $a - 3$ v\u00e0 $3 - a$","D. $|3 - a|$"],"hint":"V\u1edbi s\u1ed1 d\u01b0\u01a1ng $a$, s\u1ed1 $\\sqrt{a}$ \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a $a$","explain":"<span class='basic_left'>C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ${{\\left( a - 3 \\right)}^{2}}$ l\u00e0 $|3 - a|$ (v\u00ec $|3 -a|=|a - 3| \\ge0$).<br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D <\/span>","column":2}]}],"id_ques":439},{"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":"C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ${{\\left( a+2 \\right)}^{2}}$ l\u00e0:","select":["A. $a+2$","B. $|a+2|$","C. $a+ 2$ v\u00e0 $-a -2$","D. $-a - 2$"],"hint":"V\u1edbi s\u1ed1 d\u01b0\u01a1ng $a$, s\u1ed1 $\\sqrt{a}$ \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a $a$","explain":"<span class='basic_left'>C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ${{\\left( a+2 \\right)}^{2}}$ l\u00e0 $|a+2|$ (v\u00ec $|a+2| \\ge 0$).<br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B <\/span><\/span>","column":2}]}],"id_ques":440},{"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":"Nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh $x^2=324$ l\u00e0:","select":["A. $x= \\pm18$","B. $x= 18$","C. $x= -18$","D. $x= -324$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b>B\u01b0\u1edbc 1: <\/b>Ph\u00e2n t\u00edch $324$ v\u1ec1 d\u1ea1ng $a^2$<br\/><b>B\u01b0\u1edbc 2:<\/b> T\u00ecm $x$<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i<\/span> <br\/>Ta c\u00f3: $324 = 18^2 = (-18)^2$<br\/>$\\Rightarrow$ $x^2=324$<br\/>$\\Leftrightarrow x^2 = 18^2$ ho\u1eb7c $x^2 = (-18)^2$<br\/>$\\Leftrightarrow x=18$ ho\u1eb7c $x=-18$ <br\/>V\u1eady nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0: $x \\in$ {$-18; 18$} <br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A <\/span><br\/><span class='basic_green'> Nh\u1eadn x\u00e9t: <\/span><br\/>C\u00e1ch 2: Chuy\u1ec3n v\u1ebf $324$ sang v\u1ebf tr\u00e1i r\u1ed3i bi\u1ebfn \u0111\u1ed5i v\u1ebf tr\u00e1i v\u1ec1 d\u1ea1ng ph\u01b0\u01a1ng tr\u00ecnh t\u00edch.<\/span>","column":2}]}],"id_ques":441},{"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":"Nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh $x^2=3,2$ l\u00e0:","select":["A. $x= \\sqrt{3,2}$","B. $x= -\\sqrt{3,2}$","C. $x= \\pm\\sqrt{3,2}$","D. $x= 10,24$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b>B\u01b0\u1edbc 1:<\/b> Chuy\u1ec3n v\u1ebf $3,2$<br\/><b>B\u01b0\u1edbc 2:<\/b> Ph\u00e2n t\u00edch v\u1ebf tr\u00e1i v\u1ec1 d\u1ea1ng nh\u00e2n t\u1eed<br\/><b>B\u01b0\u1edbc 3:<\/b> T\u00ecm $x$<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i<\/span><br\/>Ta c\u00f3:<br\/>$x^2=3,2$<br\/>$\\Leftrightarrow x^2-3,2=0$<br\/>$\\Leftrightarrow \\,x^2-\\sqrt{3,2^2}=0$<br\/>$ \\Leftrightarrow\\,\\left( x-\\sqrt{3,2} \\right)\\left( x+\\sqrt{3,2} \\right)=0$<br\/>$\\Leftrightarrow \\,\\left[\\begin{align}& x-\\sqrt{3,2}=0 \\\\ & x+\\sqrt{3,2}=0 \\\\ \\end{align} \\right.$<br\/> $\\Leftrightarrow\\, \\left[ \\begin{align}& x=\\sqrt{3,2} \\\\ & x=-\\sqrt{3,2} \\\\ \\end{align} \\right.$ <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C <\/span><\/span>","column":2}]}],"id_ques":442},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["8"],["7"]]],"list":[{"point":5,"width":20,"content":"T\u00ednh","type_input":"","ques":"$\\sqrt{\\dfrac{64}{49}}=\\dfrac{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}$","hint":"V\u1edbi $a\\geq 0$ th\u00ec $\\sqrt{a^2}=a$","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$\\sqrt{\\dfrac{64}{49}}=\\sqrt{{{\\left( \\dfrac{8}{7} \\right)}^{2}}}=\\dfrac{8}{7}$ <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $\\dfrac{8}{7}$<\/span><\/span>"}]}],"id_ques":443},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["11"],["9"]]],"list":[{"point":5,"width":20,"content":"T\u00ednh","type_input":"","ques":"$\\sqrt{\\dfrac{121}{81}}=\\dfrac{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}$","hint":"V\u1edbi $a\\geq 0$ th\u00ec $\\sqrt{a^2}=a$","explain":"<span class='basic_left'>$\\sqrt{\\dfrac{121}{81}}=\\sqrt{{{\\left( \\dfrac{11}{9} \\right)}^{2}}}=\\dfrac{11}{9}$ <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $\\dfrac{11}{9}$<\/span><\/span>"}]}],"id_ques":444},{"time":24,"part":[{"title":"L\u1ef1a L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"So s\u00e1nh $2.\\sqrt{9}$ v\u00e0 $8$","select":["A. $>$","B. $<$","C. $=$"],"hint":"T\u00ednh $2.\\sqrt{9}$","explain":"<span class='basic_left'>Ta c\u00f3:<br\/> $2.\\sqrt{9}=2.\\sqrt{3^2}=2.3=6$ <br\/> V\u00ec $6 < 8\\Leftrightarrow 2\\sqrt{9} <8$ <br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B<\/span> <br\/> <span class='basic_left'><span class='basic_green'>L\u01b0u \u00fd:<\/span><br\/>V\u1edbi hai s\u1ed1 $a$ v\u00e0 $b$ d\u01b0\u01a1ng ta c\u00f3: $a < b\\Leftrightarrow \\sqrt{a}<\\sqrt{b}$<\/span> <br\/><br\/><\/span>","column":3}]}],"id_ques":445},{"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":"So s\u00e1nh $3.\\sqrt{4}$ v\u00e0 $6$","select":["A. $>$","B. $<$","C. $=$"],"hint":"T\u00ednh $3.\\sqrt{4}$","explain":"<span class='basic_left'>Ta c\u00f3:<br\/> $3.\\sqrt{4}=3.\\sqrt{2^2}=3.2=6$ <br\/> $\\Leftrightarrow 3.\\sqrt{4} =6$ <br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C<\/span> <br\/> <span class='basic_left'><span class='basic_green'>L\u01b0u \u00fd:<\/span><br\/>V\u1edbi hai s\u1ed1 $a$ v\u00e0 $b$ d\u01b0\u01a1ng ta c\u00f3: $a$ < $b$ $\\Leftrightarrow \\sqrt{a}<\\sqrt{b}$<\/span> <br\/><br\/><\/span>","column":3}]}],"id_ques":446},{"time":24,"part":[{"title":"\u0110i\u1ec1n d\u1ea5u $> , < , =$ th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng sau","title_trans":"","temp":"fill_the_blank_random","correct":[[["="]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/1.png' \/><\/center>V\u1edbi $a, b$ l\u00e0 c\u00e1c s\u1ed1 kh\u00f4ng \u00e2m, ta c\u00f3: <br\/> N\u1ebfu $a = b$ th\u00ec $\\sqrt{a}$ _input_ $\\sqrt{b}$","hint":"","explain":"N\u1ebfu $a = b$ th\u00ec $\\sqrt{a}= \\sqrt{b}$. <br\/><span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0 $=$ <\/span> "}]}],"id_ques":447},{"time":24,"part":[{"title":"\u0110i\u1ec1n d\u1ea5u $> , < , =$ th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng sau","title_trans":"","temp":"fill_the_blank_random","correct":[[["<"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/2.jpg' \/><\/center>V\u1edbi $a, b$ l\u00e0 c\u00e1c s\u1ed1 kh\u00f4ng \u00e2m, ta c\u00f3:<br\/>N\u1ebfu $\\sqrt{a}$ < $\\sqrt{b}$ th\u00ec $a$ _input_ $b$","hint":"","explain":"N\u1ebfu $\\sqrt{a} < \\sqrt{b}$ th\u00ec $a < b$. <br\/><span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0 $<$ <\/span> "}]}],"id_ques":448},{"time":24,"part":[{"title":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00fang hay sai","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/2.jpg' \/><\/center>N\u1ebfu $a\\in \\mathbb{{R}^{+}}$ th\u00ec ph\u01b0\u01a1ng tr\u00ecnh ${{x}^{2}}=a$ lu\u00f4n c\u00f3 nghi\u1ec7m trong $\\mathbb{R}$","select":["A. \u0110\u00fang","B. Sai"],"hint":"X\u00e9t $a>0$ b\u1ea5t k\u1ef3, ph\u01b0\u01a1ng tr\u00ecnh $x^2=a$ c\u00f3 nghi\u1ec7m thu\u1ed9c $\\mathbb{R}$ kh\u00f4ng?","explain":"<span class='basic_left'>V\u00ec $a\\in\\mathbb{R}^+$ n\u00ean $a > 0$.<br\/> Do v\u1eady, ${{x}^{2}}=a\\Leftrightarrow\\, \\left[{\\begin{align}x&=\\sqrt{a}\\\\ x&=-\\sqrt{a}\\end{align}}\\right.$ <br\/>M\u00e0 $\\sqrt{a};-\\sqrt{a}\\in\\mathbb{R}$.<br\/> <span class='basic_pink'>Do \u0111\u00f3 kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 \u0110\u00fang <\/span><\/span>","column":2}]}],"id_ques":449},{"time":24,"part":[{"title":"Kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00fang hay sai","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai1/lv2/img\/1.png' \/><\/center>N\u1ebfu $a\\in \\mathbb{R}^{+}$ th\u00ec lu\u00f4n t\u1ed3n t\u1ea1i $x\\in \\mathbb{R}^{+}$ sao cho $\\sqrt{x}=a$ ","select":["A. \u0110\u00fang","B. Sai"],"hint":"","explain":"<span class='basic_left'>V\u00ec $a > 0$ n\u00ean lu\u00f4n t\u1ed3n t\u1ea1i $x=a^{2}\\in\\mathbb{R}^+$, sao cho $\\sqrt{x}=a$. <br\/><span class='basic_pink'>Do \u0111\u00f3 kh\u1eb3ng \u0111\u1ecbnh tr\u00ean \u0110\u00fang <\/span><\/span>","column":2}]}],"id_ques":450}],"lesson":{"save":0,"level":2}}