A. \(\left\{ \begin{array}{l}a = 0\\b \ne 0\end{array} \right.\)
B. \(\left\{ \begin{array}{l}a = 0\\b \le 0\end{array} \right.\)
C. \(\left\{ \begin{array}{l}a > 0\\b > 0\end{array} \right.\)
D. \(\left\{ \begin{array}{l}a \ne 0\\b = 0\end{array} \right.\)
A. 4
B. 2
C. 1
D. 3
A. \(\left\{ \begin{array}{l}x = 1 + 3t\\y = - 2 + 4t\end{array} \right.\)
B. \(\left\{ \begin{array}{l}x = 3 + t\\y = 4 - 2t\end{array} \right.\)
C. \(\left\{ \begin{array}{l}x = 3 + 4t\\y = 1 - 2t\end{array} \right.\)
D. \(\left\{ \begin{array}{l}x = - 3 + t\\y = - 4 - 2t\end{array} \right.\)
A. \(f\left( x \right) = 16 - 8x\)
B. \(f\left( x \right) = x - 2\)
C. \(f\left( x \right) = - x - 2\)
D. \(f\left( x \right) = 2 - 4x\)
A. \(ac > bd\)
B. \(a - c > b - d\)
C. \({a^2} > {b^2}\)
D. \(ac > bc\)
A. \(2\sqrt {10} \)
B. \(\dfrac{{\sqrt {10} }}{2}\)
C. \(3\sqrt {10} \)
D. \(\sqrt {10} \)
A. \(M + m = \dfrac{4}{3}\)
B. \(M.m = \dfrac{3}{4}\)
C. \(\dfrac{M}{m} = \dfrac{4}{3}\)
D. \(M - m = \dfrac{4}{3}\)
A. \(f\left( x \right) < 0,\,\,\forall x \in R\backslash \left\{ { - \dfrac{b}{{2a}}} \right\}\)
B. \(f\left( x \right) < 0,\,\,\forall x \in R\)
C. \(f\left( x \right) < 0,\,\,\forall x \in R\backslash \left\{ { - \dfrac{b}{a}} \right\}\)
D. \(f\left( x \right) < 0\) khi \(x \in \left( { - \dfrac{b}{{2a}};\,\, + \infty } \right)\) và \(f\left( x \right) > 0\) khi \(x \in \left( { - \infty ;\,\, - \dfrac{b}{{2a}}} \right)\)
A. \( - m > - n\)
B. \(mn > 0\)
C. \(m > - n\)
D. \(n - m < 0\)
A. \({45^0}\)
B. \({30^0}\)
C. \({135^0}\)
D. \({23^0}13'\)
A. \({a^3} > {a^2}\)
B. \(a > \dfrac{1}{a}\)
C. \(\dfrac{1}{a} > \sqrt a \)
D. \(a > \sqrt a \)
A. \(\left( { - \infty ;\,\, - 5} \right] \cup \left[ {1;\,\, + \infty } \right)\)
B. \(\left( { - \infty ;\,\, - \dfrac{1}{5}} \right] \cup \left[ {1;\,\, + \infty } \right)\)
C. \(\left[ { - 5;\,\,1} \right]\)
D. \(\left[ { - \dfrac{1}{5};\,\,1} \right]\)
A. \({150^0}\)
B. \({30^0}\)
C. \({60^0}\)
D. \({120^0}\)
A. \(24\sqrt 2 \)
B. \(48\)
C. \(24\sqrt 3 \)
D. \(24\)
A. \(2\)
B. \(3\)
C. \(1\)
D. \(0\)
A. \(x + 2y + 2 \le 0\)
B. \(2x + y + 2 \le 0\)
C. \(2x + y \ge - 2\)
D. \(2x + y - 2 \ge 0\)
A. \(2x + y - 5 = 0\)
B. \(x + 2y - 5 = 0\)
C. \(x - 2y + 5 = 0\)
D. \(x - 2y - 1 = 0\)
A. \( - 1 \le m \le 3\)
B. \(m \ge - 1\)
C. \( - 1 < m < 3\)
D. \( - 1 < m \le 3\)
A. \(0 \le m \le \dfrac{1}{3}\)
B. Kết quả khác
C. \(m > 0\)
D. \(m \le \dfrac{1}{3}\)
A. \(\left( { - 1;\,\,4} \right)\)
B. \(\left( { - 2;\,\,4} \right)\)
C. \(\left( {1;\,\,0} \right)\)
D. \(\left( { - 3;\,\,4} \right)\)
A. \(9\)
B. \(18\)
C. \(12\)
D. \(15\)
A. \(0 < m < 6\)
B. \(\left[ \begin{array}{l}m < 0\\m > 6\end{array} \right.\)
C. \(0 \le m \le 3\)
D. \(0 \le m < 6\)
A. \(\left( { - 2;\,\, - 1} \right) \cup \left( { - 1;\,\,1} \right)\)
B. \(\left( { - 4;\,\, - 1} \right) \cup \left( { - 1;\,\,2} \right)\)
C. \(\left( { - 4;\,\, - 1} \right)\)
D. \(\left( { - \infty ;\,\, - 4} \right) \cup \left( { - 1;\,\,2} \right)\)
A. \(\cos \alpha = \dfrac{1}{{\sqrt 2 }}\)
B. \(\cos \alpha = \dfrac{7}{{5\sqrt 2 }}\)
C. \(\cos \alpha = \dfrac{{ - 1}}{{5\sqrt 2 }}\)
D. \(\cos \alpha = \dfrac{1}{{5\sqrt 2 }}\)
A. \({x^2}\left( {x + 2} \right) < 0\) và \(x + 2 < 0\)
B. \(2{x^2}\left( {x + 1} \right) \le 0\) và \(x + 1 \le 0\)
C. \(\sqrt {x - 1} \ge x\) và \(\left( {2x - 1} \right)\sqrt {x - 1} \ge x\left( {2x - 1} \right)\)
D. \(2x + 1 + \dfrac{1}{{x - 2}} < \dfrac{1}{{x - 2}}\)và \(2x + 1 < 0\)
A. \(2x + 8y + 5 = 0\)
B. \(x + 4y + 10 = 0\)
C. \(x + 4y - 10 = 0\)
D. \(2x + 8y - 5 = 0\)
A. \(3\)
B. vô số
C. \(2\)
D. \(0\)
A. Đáp án khác
B. \(m \in \left( { - \infty ;\,\,2} \right) \cup \left( {\dfrac{{10}}{3};\,\, + \infty } \right)\)
C. \(m \in \left( { - \dfrac{{10}}{3};\,\, - 2} \right)\)
D. \(m \in \left( { - \infty ;\,\,2} \right) \cup \left[ {\dfrac{{10}}{3};\,\, + \infty } \right)\)
A. \(m < - 4\) hoặc \(1 < m < 5\)
B. \(m < - 1\) hoặc \( - 4 < m < 5\)
C. \(1 < m < 5\)
D. \( - 4 < m < 5\)
A. \(\left\{ {1;\,\, - 3} \right\}\)
B. \(\left\{ 1 \right\}\)
C. \(\left\{ { - 3} \right\}\)
D. Đáp án khác
A. \(P = 1\)
B. \(P = \dfrac{1}{2}\)
C. \(P = - \dfrac{1}{2}\)
D. \(P = - 1\)
A. \(0\)
B. 2
C. 1
D. -1
A. \(3x - y + 5 = 0\)
B. \(3x - y + 20 = 0\)
C. \(3x - y + 13 = 0\)
D. \(3x - y - 5 = 0\)
A. \(k = - \dfrac{1}{5}\)
B. \(\left[ \begin{array}{l}k = - 5\\k = \dfrac{1}{5}\end{array} \right.\)
C. \(\left[ \begin{array}{l}k = 5\\k = - \dfrac{1}{5}\end{array} \right.\)
D. \(k = 5\)
A. \(\dfrac{{1 + 3{m^2}}}{9}\)
B. \(\dfrac{{1 - 3m}}{4}\)
C. \(\dfrac{{{m^2} + 3}}{3}\)
D. \(\dfrac{{1 + 3m}}{4}\)
A. 5
B. 9
C. 4
D. 2
A. \(2019\)
B. \(4038\)
C. \(4037\)
D. \(4036\)
A. \(m \in \left[ { - \dfrac{1}{2};\,\,0} \right) \cup \left( {0;\,\,\dfrac{1}{2}} \right]\)
B. \(m \in \left( { - \infty ;\,\,\dfrac{1}{2}} \right]\)
C. \(m \in \left[ {\dfrac{1}{2};\,\, + \infty } \right)\)
D. \(m \in \left[ { - \dfrac{1}{2};\,\,\dfrac{1}{2}} \right]\)
A. \(S > 0\)
B. \(S < 0\)
C. \({S^2} > 16\)
D. \(0 \le S \le 4\)
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