A. \(S = \left\{ { - \sqrt 2 ;\,\,\sqrt 2 } \right\}.\)
B. \(S = \left\{ { - 2\sqrt 2 ;\,\,2\sqrt 2 } \right\}.\)
C. \(S = \left\{ { - 2;\,\,2} \right\}.\)
D. \(S = \left\{ { - 1;\,\,1} \right\}.\)
A. \(S = \left\{ {2;\,\,\frac{1}{2}} \right\}.\)
B. \(S = \left\{ { - 2;\,\, - \frac{1}{2}} \right\}.\)
C. \(S = \left\{ { - 2;\,\,\frac{1}{2}} \right\}.\)
D. \(S = \left\{ {2;\,\, - \frac{1}{2}} \right\}.\)
A. \(\left( {x;\,y} \right) = \left( {4; - 1} \right).\)
B. \(\left( {x;\,y} \right) = \left( { - 1;6} \right).\)
C. \(\left( {x;\,y} \right) = \left( {3; - 2} \right).\)
D. \(\left( {x;\,y} \right) = \left( {2; - 3} \right).\)
A. \({\rm{}}\,\,\left( { - 4; - 8} \right);\,\,\left( {1; - \frac{1}{2}} \right).\)
B. \({\rm{}}\,\,\left( {4; - 8} \right);\,\,\left( { - 1; - \frac{1}{2}} \right).\)
C. \({\rm{}}\,\,\left( { - 4;8} \right);\,\,\left( { - 1;\frac{1}{2}} \right).\)
D. \({\rm{}}\,\,\left( {4;8} \right);\,\,\left( {1;\frac{1}{2}} \right).\)
A. \({\rm{}}\,\,m = \frac{{ - 4}}{5}.\)
B. \({\rm{}}\,\,m = \frac{4}{5}.\)
C. \({\rm{}}\,\,m = \frac{5}{4}.\)
D. \({\rm{}}\,\,m = \frac{{ - 5}}{4}.\)
A. \(2\) lít
B. \(3\) lít
C. \(4\) lít
D. \(5\) lít
A. \(3,9\) km.
B. \(3,8\) km.
C. \(3,7\) km.
D. \(3,6\) km.
A. \(\left[ \begin{array}{l}x = - 3\\x = \frac{5}{3}\end{array} \right.\)
B. \(\left[ \begin{array}{l}x = - 3\\x = - \frac{5}{3}\end{array} \right.\)
C. \(\left[ \begin{array}{l}x = 3\\x = \frac{5}{3}\end{array} \right.\)
D. \(\left[ \begin{array}{l}x = 3\\x = - \frac{5}{3}\end{array} \right.\)
A. \(x = \pm \frac{1}{2}\)
B. \(x = \pm 1\)
C. \(x = \pm \frac{{\sqrt 2 }}{2}\)
D. \(x = \pm \sqrt 2 \)
A. \(A\left( {2; - 2} \right)\) và \(B\left( {4; - 8} \right)\)
B. \(A\left( { - 2;2} \right)\) và \(B\left( {4; - 8} \right)\)
C. \(A\left( { - 2;2} \right)\) và \(B\left( { - 4; - 8} \right)\)
D. \(A\left( {2; - 2} \right)\) và \(B\left( { - 4; - 8} \right)\)
A. \(300{m^2}.\)
B. \(200{m^2}.\)
C. \(250{m^2}.\)
D. \(150{m^2}.\)
A. \(\begin{array}{l}AB = 3\,\,\left( {cm} \right)\,\,;\,\,AC = 3\sqrt 3 \,\,\left( {cm} \right)\\S = \frac{{9\pi - 9\sqrt 3 }}{2}\,\,\left( {c{m^2}} \right)\end{array}\)
B. \(\begin{array}{l}AB = 2\,\,\left( {cm} \right)\,\,;\,\,AC = 2\sqrt 2 \,\,\left( {cm} \right)\\S = 2\pi - 2\sqrt 2 \,\,\left( {c{m^2}} \right)\end{array}\)
C. \(\begin{array}{l}AB = 3\,\,\left( {cm} \right)\,\,;\,\,AC = 3\sqrt 2 \,\,\left( {cm} \right)\\S = \frac{{9\pi - 9\sqrt 2 }}{2}\,\,\left( {c{m^2}} \right)\end{array}\)
D. \(\begin{array}{l}AB = 2\,\,\left( {cm} \right)\,\,;\,\,AC = 2\sqrt 3 \,\,\left( {cm} \right)\\S = 2\pi - 2\sqrt 3 \,\,\left( {c{m^2}} \right)\end{array}\)
A. \(S = \left\{ { - 1;\,\frac{{11}}{5}} \right\}.\)
B. \(S = \left\{ { - 1;\, - \frac{{11}}{5}} \right\}.\)
C. \(S = \left\{ {1;\,\frac{{11}}{5}} \right\}.\)
D. \(S = \left\{ {1;\, - \frac{{11}}{5}} \right\}.\)
A. \(S = \left\{ { - 1;\,\,1} \right\}.\)
B. \(S = \left\{ { - 2;\,\,2} \right\}.\)
C. \(S = \left\{ { - \sqrt 2 ;\,\,\sqrt 2 } \right\}.\)
D. \(S = \left\{ { - \sqrt 3 ;\,\,\sqrt 3 } \right\}.\)
A. \(375\,\,\left( {{m^2}} \right)\)
B. \(400\,\,\left( {{m^2}} \right)\)
C. \(350\,\,\left( {{m^2}} \right)\)
D. \(425\,\,\left( {{m^2}} \right)\)
A. \(\,\,\left( {2; - 1} \right),\,\,\left( { - 4;\,4} \right).\)
B. \(\,\,\left( {2; - 1} \right),\,\,\left( { - 4;\, - 4} \right).\)
C. \(\,\,\left( { - 2; - 1} \right),\,\,\left( {4;\, - 4} \right).\)
D. \(\,\,\left( { - 2; - 1} \right),\,\,\left( {4;\,4} \right).\)
A. \(\,\,m = - 1\,;\,\,m = 3\)
B. \( \,\,m = 1\,;\,\,m = 3\)
C. \( \,\,m = - 1\,;\,\,m = - 3\)
D. \( \,\,m = 1\,;\,\,m = - 3\)
A. \(15\) giáo viên và \(235\) học sinh
B. \(18\) giáo viên và \(250\) học sinh
C. \(16\) giáo viên và \(265\) học sinh
D. \(20\) giáo viên và \(280\) học sinh
A. \(R = 5\,\,cm.\)
B. \(R = 6\,\,cm.\)
C. \(R = 7,5\,\,cm.\)
D. \(R = 8,5\,\,cm.\)
A. \(\left( {x;y} \right) = \left( { - 2; - 1} \right)\)
B. \(\left( {x;y} \right) = \left( {2; - 1} \right)\)
C. \(\left( {x;y} \right) = \left( {2;1} \right)\)
D. \(\left( {x;y} \right) = \left( { - 2;1} \right)\)
A. \(\left[ \begin{array}{l}{x_1} = \sqrt 2 + 3\\{x_2} = \sqrt 2 - 3\end{array} \right.\)
B. \(\left[ \begin{array}{l}{x_1} = 2\sqrt 2 + 3\\{x_2} = 2\sqrt 2 - 3\end{array} \right.\)
C. \(\left[ \begin{array}{l}{x_1} = \sqrt 2 + \sqrt 3 \\{x_2} = \sqrt 2 - \sqrt 3 \end{array} \right.\)
D. \(\left[ \begin{array}{l}{x_1} = - \sqrt 2 + 3\\{x_2} = - \sqrt 2 - 3\end{array} \right.\)
A. \(A = \frac{{\sqrt x + 2}}{{\sqrt x + 1}}\)
B. \(A = \frac{{\sqrt x + 1}}{{\sqrt x + 2}}\)
C. \(A = \frac{{\sqrt x + 1}}{{\sqrt x - 2}}\)
D. \(A = \frac{{\sqrt x - 2}}{{\sqrt x + 1}}\)
A. \(15\)
B. \(16\)
C. \(17\)
D. \(18\)
A. \(\,\,m = 2017\)
B. \(\,\,m = 2018\)
C. \(\,\,m = 2019\)
D. \(\,\,m = 2020\)
A. \({S_{\min }} = 2017\)
B. \({S_{\min }} = 2018\)
C. \({S_{\min }} = 2019\)
D. \({S_{\min }} = 2020\)
A. \(\left( {x;y} \right) = \left( {1;\frac{1}{2}} \right).\)
B. \(\left( {x;y} \right) = \left( { - 1;\frac{1}{2}} \right).\)
C. \(\left( {x;y} \right) = \left( {1; - 1} \right).\)
D. \(\left( {x;y} \right) = \left( { - 1;1} \right).\)
A. \(m = \pm 3\)
B. \(m = \pm \sqrt 3\)
C. \(m = \pm \sqrt 3 \)
D. \(m = \pm 3\)
A. \(15\)
B. \(20\)
C. \(18\)
D. \(22\)
A. \({P_{\min }} = \frac{{65}}{3}\)
B. \({P_{\min }} = \frac{{64}}{3}\)
C. \({P_{\min }} = 21\)
D. \({P_{\min }} = 20\)
A. \(\left\{ \begin{array}{l}x + 5y = 9\\6x + 2y = - 2\end{array} \right.\)
B. \(\left\{ \begin{array}{l} - 2x + y = 7\\x - \frac{3}{4}y = 3\end{array} \right.\)
C. \(\left\{ \begin{array}{l}x + y = 1\\ - 2x + y = 4\end{array} \right.\)
D. \(\left\{ \begin{array}{l}2x - 2y = 0\\x + y = 3\end{array} \right.\)
A. \(m = - 2\)
B. \(m = 2\)
C. \(m = \pm 2\)
D. \(m = 16\)
A. \({60^o}\)
B. \({120^o}\)
C. \({90^o}\)
D. \({150^o}\)
A. \(10\pi \;\left( {c{m^2}} \right)\)
B. \(100\pi \;\left( {c{m^2}} \right)\)
C. \(50\pi \;\left( {c{m^2}} \right)\)
D. \(25\pi \;\left( {c{m^2}} \right)\)
A. \(\left( {x;y} \right) = \left( {\frac{5}{2}; - 2} \right)\)
B. \(\left( {x;y} \right) = \left( {\frac{5}{2};2} \right)\)
C. \(\left( {x;y} \right) = \left( { - \frac{5}{2}; - 2} \right)\)
D. \(\left( {x;y} \right) = \left( { - \frac{5}{2};2} \right)\)
A. 4 ngày
B. 5 ngày
C. 6 ngày
D. 7 ngày
A. 15 km/h
B. 16 km/h
C. 17 km/h
D. 18 km/h
A. \(\left( {x;\;y} \right) = \left( {16;\;20} \right).\)
B. \(\left( {x;\;y} \right) = \left( {16;\;18} \right).\)
C. \(\left( {x;\;y} \right) = \left( {17;\;18} \right).\)
D. \(\left( {x;\;y} \right) = \left( {17;\;20} \right).\)
A. \(m = \frac{{24}}{5}\)
B. \(m = 5\)
C. \(m = 2\)
D. \(m = \frac{4}{5}\)
A. \(\frac{1}{2} + 2\sqrt 2 \)
B. \(\frac{1}{2} + \sqrt 2 \)
C. \(\frac{1}{4} + 2\sqrt 2 \)
D. \(\frac{1}{4} + \sqrt 2 \)
A. \(x = 3\) hoặc \(x = \frac{4}{3}\)
B. \(x = 6\) hoặc \(x = \frac{8}{3}\)
C. \(x = 8\) hoặc \(x = \frac{{31}}{3}\)
D. \(x = - \frac{8}{3}\) hoặc \(x = - 3\)
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