{"segment":[{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/toan/daiso/bai27/lv1/img\/4.jpg' \/><\/center><br\/>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|x| + 5 = 6$","select":[" A. $x = 11$ "," B. $x = 11$ ho\u1eb7c $x = -11$","C. $x = 1$ ho\u1eb7c $x = -1$","D. $x = 1$ "],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|x| + 5 = 6$<br\/>$\\Leftrightarrow |x| = 6 - 5$<br\/>$\\Leftrightarrow |x| = 1$<br\/>$\\Rightarrow x = 1$ ho\u1eb7c $x = -1$<br\/>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'>C. $x = 1$ ho\u1eb7c $x = -1$<\/span><\/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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/toan/daiso/bai27/lv1/img\/4.jpg' \/><\/center><br\/>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $2|x| - 5 = 7$","select":[" A. $x = 11$ "," B. $x = 11$ ho\u1eb7c $x = -11$","C. $x = 6$ ho\u1eb7c $x = -6$","D. $x = 6$ "],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$2|x| - 5 = 7$<br\/>$\\Leftrightarrow 2|x| = 7 + 5$<br\/>$\\Leftrightarrow 2|x| = 12$<br\/>$\\Leftrightarrow |x| = 12 : 2$<br\/>$\\Leftrightarrow |x| = 6$<br\/>$\\Rightarrow x = 6$ ho\u1eb7c $x = -6$<br\/>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'>C. $x = 6$ ho\u1eb7c $x = -6$<\/span><\/span><\/span>","column":2}]}],"id_ques":1152},{"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/lop8/toan/daiso/bai27/lv1/img\/4.jpg' \/><\/center><br\/>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|x - 3| = 9$","select":[" A. $x = 12$ ho\u1eb7c $x = -6$ "," B. $x = 6$ ho\u1eb7c $x = -6$","C. $x = 12$ ho\u1eb7c $x = -12$","D. $x = 12$ ho\u1eb7c $x = 6$ "],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|x - 3| = 9$<br\/>$\\Rightarrow$ $\\left[\\begin{array}{l} x - 3 = 9\\\\ x - 3 = -9\\end{array} \\right.$<br\/>$\\Leftrightarrow$ $\\left[\\begin{array}{l} x = 9 + 3\\\\ x = -9 + 3 \\end{array} \\right.$<br\/>$\\Leftrightarrow$ $\\left[\\begin{array}{l} x = 12\\\\ x = -6 \\end{array} \\right.$<br\/>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'> A. $x = 12$ ho\u1eb7c $x = -6$<\/span><\/span><\/span>","column":2}]}],"id_ques":1153},{"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/lop8/toan/daiso/bai27/lv1/img\/4.jpg' \/><\/center><br\/>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|x - 5| = 12$","select":[" A. $x = 17$ ho\u1eb7c $x = -17$ "," B. $x = 17$ ho\u1eb7c $x = -7$","C. $x = 7$ ho\u1eb7c $x = -7$","D. $x = 17$ ho\u1eb7c $x = 7$ "],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|x - 5| = 12$<br\/>$\\Rightarrow$ $\\left[\\begin{array}{l} x - 5 = 12\\\\ x - 5 = -12\\end{array} \\right.$<br\/>$\\Leftrightarrow$ $\\left[\\begin{array}{l} x = 12 + 5\\\\ x = -12 + 5 \\end{array} \\right.$<br\/>$\\Leftrightarrow$ $\\left[\\begin{array}{l} x = 17\\\\ x = -7 \\end{array} \\right.$<br\/>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'> B. $x = 17$ ho\u1eb7c $x = -7$<\/span><\/span><\/span>","column":2}]}],"id_ques":1154},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/toan/daiso/bai27/lv1/img\/7.jpg' \/><\/center><br\/>B\u1ecf d\u1ea5u gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i v\u00e0 r\u00fat g\u1ecdn bi\u1ec3u th\u1ee9c: $A = 4x + 5 - |7x|$ v\u1edbi $x \\geq 0$","select":["$A = 11x - 5$ ","$A = 3x + 5$","$A = 11x + 5$","$A = -3x + 5$ "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i \u0111\u1ec3 r\u00fat g\u1ecdn: <br\/> $|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu x} \\geq 0 \\\\-x \\hspace{0,2cm}\\text{n\u1ebfu x} < 0 \\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x \\geq 0$, ta c\u00f3 $7x \\geq 0$ n\u00ean $|7x| = 7x$<br\/>V\u1eady<br\/>$A = 4x + 5 - |7x| = 4x + 5 - 7x = -3x + 5$<br\/>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'> $A = -3x + 5$<\/span><\/span>","column":2}]}],"id_ques":1155},{"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/lop8/toan/daiso/bai27/lv1/img\/7.jpg' \/><\/center><br\/>B\u1ecf d\u1ea5u gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i v\u00e0 r\u00fat g\u1ecdn bi\u1ec3u th\u1ee9c: $B = 5x - 11 + |8x|$ v\u1edbi $x < 0$","select":[" A. $B = 3x - 11$ "," B. $B = -3x - 11$","C. $B = 13x - 11$","D. $B = 13x + 11$ "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i \u0111\u1ec3 r\u00fat g\u1ecdn: <br\/> $|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu x} \\geq 0\\\\-x \\hspace{0,2cm}\\text{n\u1ebfu x} < 0 \\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x < 0$, ta c\u00f3 $8x < 0$ n\u00ean $|8x| = -8x$<br\/>V\u1eady<br\/>$B = 5x - 11 + |8x| = 5x - 11 - 8x = -3x - 11$<br\/>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'>B. $B = -3x - 11$<\/span><\/span>","column":2}]}],"id_ques":1156},{"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/lop8/toan/daiso/bai27/lv1/img\/5.jpg' \/><\/center><br\/>B\u1ecf d\u1ea5u gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i v\u00e0 r\u00fat g\u1ecdn bi\u1ec3u th\u1ee9c: $C = |x - 1| + 2x$ v\u1edbi $x < 0$","select":[" A. $C = x + 1$ "," B. $C = x - 1$","C. $C = -x - 1$","D. $C = 3x + 1$ "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i \u0111\u1ec3 r\u00fat g\u1ecdn: <br\/> $|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu x} \\geq 0\\\\-x \\hspace{0,2cm}\\text{n\u1ebfu x} < 0 \\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x < 0$, ta c\u00f3 $x - 1 < 0$ n\u00ean $|x - 1| = -(x - 1) = -x + 1$<br\/>V\u1eady<br\/>$C = |x - 1| + 2x = -x + 1 + 2x = x + 1$<br\/>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 <span class='basic_pink'>A. $C = x + 1$<\/span><\/span>","column":2}]}],"id_ques":1157},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["3x"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"N\u1ebfu $x > 0$ th\u00ec $|3x| =$ <span class='basic_hoi_black'>?<\/span><br\/><b>\u0110\u00e1p \u00e1n:<\/b> $|3x| = $ _input_ ","hint":"","explain":"<span class='basic_left'>Khi $x > 0$, ta c\u00f3 $3x > 0$ n\u00ean $|3x| = 3x$<br\/>V\u1eady \u0111\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 <span class='basic_pink'>$3x$<\/span><\/span>"}]}],"id_ques":1158},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-6x"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"N\u1ebfu $x < 0$ th\u00ec $|-6x| =$ <span class='basic_hoi_black'>?<\/span><br\/><b>\u0110\u00e1p \u00e1n:<\/b> $|-6x| = $ _input_ ","hint":"","explain":"<span class='basic_left'>Khi $x < 0$, ta c\u00f3 $-6x > 0$ n\u00ean $|-6x| = -6x$<br\/>V\u1eady \u0111\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 <span class='basic_pink'>$-6x$<\/span><\/span>"}]}],"id_ques":1159},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["x + 5","5 + x","x+5","5+x"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"N\u1ebfu $x > 0$ th\u00ec $|x + 5| =$ <span class='basic_hoi_black'>?<\/span><br\/><b>\u0110\u00e1p \u00e1n:<\/b> $|x + 5| = $ _input_ ","hint":"","explain":"<span class='basic_left'>Khi $x > 0$, ta c\u00f3 $x + 5 > 0$ n\u00ean $|x + 5| = x + 5$<br\/>V\u1eady \u0111\u00e1p \u00e1n c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 <span class='basic_pink'>$x + 5$<\/span><\/span>"}]}],"id_ques":1160},{"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":[[["2"],["7"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|3x - 2| = 4x$<br\/><b>\u0110\u00e1p \u00e1n:<\/b> $x = \\dfrac{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}$","hint":"","explain":"<span class='basic_left'> + V\u1edbi $x \\geq \\dfrac{2}{3}$ ta c\u00f3<br\/>$|3x - 2| = 4x \\Leftrightarrow 3x - 2 = 4x \\Leftrightarrow 4x - 3x = -2 \\Leftrightarrow x = -2$ (lo\u1ea1i)<br\/>+ V\u1edbi $x < \\dfrac{2}{3}$ ta c\u00f3<br\/>$|3x - 2| = 4x \\Leftrightarrow 3x - 2 = -4x \\Leftrightarrow 3x + 4x = 2 \\Leftrightarrow 7x = 2 \\Leftrightarrow x = \\dfrac{2}{7}$ (nh\u1eadn)<br\/>V\u1eady nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 $x = \\dfrac{2}{7}$<br\/>S\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 <span class='basic_pink'>$2 ; 7$<\/span><\/span>"}]}],"id_ques":1161},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["1"],["5"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|5 - 3x| = 2x$<br\/><b>\u0110\u00e1p \u00e1n:<\/b> $x = $ _input_ ; $x = $ _input_","hint":"","explain":"<span class='basic_left'>+ V\u1edbi $x \\leq \\dfrac{5}{3}$ ta c\u00f3:<br\/>$|5 - 3x| = 2x \\Leftrightarrow 5 - 3x = 2x \\Leftrightarrow 2x + 3x = 5 \\Leftrightarrow 5x = 5 \\Leftrightarrow x = 1$ (nh\u1eadn)<br\/>+ V\u1edbi $x > \\dfrac{5}{3}$ ta c\u00f3:<br\/>$|5 - 3x| = 2x \\Leftrightarrow 5 - 3x = -2x \\Leftrightarrow -2x + 3x = 5 \\Leftrightarrow x = 5 $ (nh\u1eadn) <br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 <span class='basic_pink'>$1; 5$<\/span><\/span>"}]}],"id_ques":1162},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["2"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|4 + x| = 3x$<br\/><b>\u0110\u00e1p \u00e1n:<\/b> $x = $ _input_ ","hint":"","explain":"<span class='basic_left'> + V\u1edbi $x \\geq -4$ ta c\u00f3:<br\/>$|4 + x| = 3x \\Leftrightarrow 4 + x = 3x \\Leftrightarrow 3x - x = 4 \\Leftrightarrow 2x = 4 \\Leftrightarrow x = 2$ (nh\u1eadn)<br\/>+ V\u1edbi $x < -4$ ta c\u00f3:<br\/>$|4 + x| = 3x \\Leftrightarrow 4 + x = -3x \\Leftrightarrow x + 3x = -4 \\Leftrightarrow 4x = -4 \\Leftrightarrow x = -1$ (lo\u1ea1i) <br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 <span class='basic_pink'>$2$<\/span><\/span>"}]}],"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/toan/daiso/bai27/lv1/img\/9.jpg' \/><\/center><br\/> N\u1ebfu $x > 0$ th\u00ec $|-4x| = -4x$. <b>\u0110\u00fang<\/b> hay <b> Sai<\/b>?","select":[" A. \u0110\u00fang"," B. Sai "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i: <br\/>$|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x \\geq 0\\\\ -x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x < 0\\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x > 0$, ta c\u00f3 $-4x < 0$ n\u00ean $|-4x| = -(-4x) = 4x$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n <span class='basic_pink'>B. Sai<\/span> ","column":2}]}],"id_ques":1164},{"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/lop8/toan/daiso/bai27/lv1/img\/8.jpg' \/><\/center><br\/> N\u1ebfu $x < 0$ th\u00ec $|9x| = 9x$. <b>\u0110\u00fang<\/b> hay <b> Sai<\/b>?","select":[" A. \u0110\u00fang"," B. Sai "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i: <br\/>$|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x \\geq 0\\\\ -x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x < 0\\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x < 0$, ta c\u00f3 $9x < 0$ n\u00ean $|9x| = -9x$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n <span class='basic_pink'>B. Sai<\/span> ","column":2}]}],"id_ques":1165},{"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/lop8/toan/daiso/bai27/lv1/img\/8.jpg' \/><\/center><br\/> N\u1ebfu $x < 0$ th\u00ec $|x - 4| = 4 - x$. <b>\u0110\u00fang<\/b> hay <b> Sai<\/b>?","select":[" A. \u0110\u00fang"," B. Sai "],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i: <br\/>$|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x \\geq 0\\\\ -x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x < 0\\end{array} \\right.$","explain":"<span class='basic_left'>Khi $x < 0$, ta c\u00f3 $x - 4 < 0$ n\u00ean $|x - 4| = -(x - 4) = 4 - x$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n <span class='basic_pink'>A. \u0110\u00fang<\/span> ","column":2}]}],"id_ques":1166},{"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\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|x + 1| = |5|$","select":[" A. $S = \\left\\{-6 ; 4\\right\\}$"," B. $S = \\left\\{-6 ; -4\\right\\}$ ","C. $S = \\left\\{6 ; 4\\right\\}$","D. $S = \\left\\{6 ; -4\\right\\}$"],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i: <br\/>$|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x \\ge 0\\\\ -x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x < 0\\end{array} \\right.$","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|x + 1| = |5|$ <br\/>$\\Leftrightarrow |x + 1| = 5$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x + 1 = 5\\\\ x + 1 = -5\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x = 4\\\\ x = -6\\end{array} \\right.$<br\/>V\u1eady t\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 $S = \\left\\{-6 ; 4\\right\\}$<br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A <\/span><br\/> ","column":2}]}],"id_ques":1167},{"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":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: $|2x| = |8|$","select":[" A. $S = \\left\\{-2 ; 4\\right\\}$"," B. $S = \\left\\{-6 ; -4\\right\\}$ ","C. $S = \\left\\{-4 ; 4\\right\\}$","D. $S = \\left\\{6 ; -4\\right\\}$"],"hint":"\u00c1p d\u1ee5ng \u0111\u1ecbnh ngh\u0129a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i: <br\/>$|x| = \\left\\{\\begin{array}{l} x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x \\geq 0\\\\ -x \\hspace{0,2cm}\\text{n\u1ebfu}\\hspace{0,2cm} x < 0\\end{array} \\right.$","explain":"<span class=&rsquo;basic_left&rsquo;>Ta c\u00f3:<br\/>$|2x| = |8|$ <br\/>$\\Leftrightarrow |2x| = 8$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} 2x = 8\\\\ 2x = -8\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x = 4\\\\ x = -4\\end{array} \\right.$<br\/>V\u1eady t\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 $S = \\left\\{-4 ; 4\\right\\}$<br\/><span class=&rsquo;basic_pink&rsquo;>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C <\/span><br\/> ","column":2}]}],"id_ques":1168},{"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\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh: $|x + 1| = |2 - 2x|$ l\u00e0:","select":[" A. $S = \\left\\{-1 ; 3\\right\\}$"," B. $S = \\left\\{1 ; 3\\right\\}$ ","C. $S = \\left\\{\\dfrac{-1}{3} ; 3\\right\\}$","D. $S = \\left\\{\\dfrac{1}{3} ; 3\\right\\}$"],"hint":"$|A(x)| = |B(x)| \\Leftrightarrow A(x) = \\pm B(x)$ ","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|x + 1| = |2 - 2x|$ <br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x + 1 = 2 - 2x\\\\ x + 1 = -(2- 2x)\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x + 2x = 2 - 1\\\\ x + 1 = -2 + 2x\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} 3x = 1\\\\ 2x - x = 1 + 2\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x = \\dfrac{1}{3} \\\\ x = 3\\end{array} \\right.$<br\/>V\u1eady t\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 $S = \\left\\{\\dfrac{1}{3} ; 3\\right\\}$<br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D <\/span><br\/> ","column":2}]}],"id_ques":1169},{"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\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh $|-x + 5| = |2x - 1|$ l\u00e0:","select":["$S = \\left\\{-2; 4\\right\\}$","$S = \\left\\{2; 4\\right\\}$ ","$S = \\left\\{-4; 2\\right\\}$","$S = \\left\\{-2 ; -4\\right\\}$"],"hint":"$|A(x)| = |B(x)| \\Leftrightarrow A(x) = \\pm B(x)$ ","explain":"<span class='basic_left'>Ta c\u00f3:<br\/>$|-x + 5| = |2x - 1|$ <br\/>$\\Leftrightarrow \\left[\\begin{array}{l} -x + 5 = 2x - 1\\\\ -x + 5 = -(2x - 1)\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} 2x + x = 5 + 1\\\\ -x + 5 = -2x + 1\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} 3x = 6\\\\ -x + 2x = 1 - 5\\end{array} \\right.$<br\/>$\\Leftrightarrow \\left[\\begin{array}{l} x = 2 \\\\ x = -4\\end{array} \\right.$<br\/>V\u1eady t\u1eadp nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 $S = \\left\\{-4; 2\\right\\}$<br\/><span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C <\/span><br\/> ","column":2}]}],"id_ques":1170}],"lesson":{"save":0,"level":1}}