A. 4
B. 5
C. 7
D. 6
A. \(\left[ { - 4; - 2} \right) \cup \left( {3;7} \right].\)
B. \(\left[ { - 4;2} \right) \cup \left( {3;7} \right).\)
C. \(\left( { - \infty ;2} \right).\)
D. \(\left( { - \infty ; - 2} \right) \cup \left( {3; + \infty } \right).\)
A. 16
B. 14
C. 15
D. 17
A. \({\Delta _1}\) vuông góc với \({\Delta _3}\)
B. \({\Delta _1}\) vuông góc với \({\Delta _2}\)
C. \({\Delta _2}\) vuông góc với \({\Delta _3}\)
D. Không có hai đường thẳng nào vuông góc.
A. \(y = \frac{1}{2}x + \frac{5}{2}.\)
B. \(y = -\frac{1}{2}x + \frac{5}{2}.\)
C. \(y = -\frac{1}{2}x + \frac{7}{2}.\)
D. \(2y+x=6\)
A. \(M\left( { - 2;2} \right).\)
B. \(M(-2;3)\)
C. \(M(2;-2)\)
D. \(M(-2;-2)\)
A. \(m < - \frac{1}{2}.\)
B. \(m<-1\)
C. \(m>0\)
D. \( - 4 < m \le - \frac{1}{2}.\)
A. \(y = {x^2} - 4x - 1.\)
B. \(y = 2{x^2} - 4x - 1.\)
C. \(y = - 2{x^2} - 4x - 1.\)
D. \(y = 2{x^2} - 4x + 1.\)
A. \(I\left( {\frac{5}{4};\frac{{49}}{8}} \right).\)
B. \(I\left( { - \frac{5}{4};\frac{{21}}{8}} \right).\)
C. \(I\left( {\frac{5}{4}; - \frac{{49}}{8}} \right).\)
D. \(I\left( { - \frac{5}{4}; - \frac{{21}}{8}} \right).\)
A. \(\left( { - \infty ; - 2} \right).\)
B. \(\left( { - 2;2} \right).\)
C. \(\left( { - 1; + \infty } \right).\)
D. \(\left( { - \infty ; + \infty } \right).\)
A. \(y = 2{x^2} - 4x.\)
B. \(y = 2{x^2} - 8x + 4.\)
C. \(y = 2{x^2} - 8x - 4.\)
D. \(y = 2{x^2} + 8x - 12.\)
A. 0
B. 1
C. 3
D. 2
A. \(x \ne \pm 1.\)
B.
\(\left\{ \begin{array}{l}
x \ne 1\\
x \ne 0
\end{array} \right..\)
C.
\(\left\{ \begin{array}{l}
x \ne \pm 1\\
x \ne 0
\end{array} \right..\)
D.
\(\left\{ \begin{array}{l}
x \ne - 1\\
x \ne 0
\end{array} \right..\)
A. \(5\left| { - x + 5} \right| = x + 2.\)
B. \(\left| {x - 5} \right| = x + 2.\)
C. \({\left( { - x + 5} \right)^2} = {\left( {5x + 10} \right)^2}.\)
D. \(5{\left( {x - 5} \right)^2} = {\left( {x + 2} \right)^2}.\)
A. \(S=5\)
B. \(S=-5\)
C. \(S=3\)
D. \(S=4\)
A. \(S = \left\{ { - 1;4} \right\}.\)
B. \(S = \left\{ { - 1;\frac{4}{3}} \right\}.\)
C. \(S = \left\{ {1;\frac{4}{3}} \right\}.\)
D. \(S = \left\{ { - 1; \pm \frac{4}{3}} \right\}.\)
A.
\(\left\{ \begin{array}{l}
x = - 2\\
y = 1
\end{array} \right..\)
B.
\(\left\{ \begin{array}{l}
x = 2\\
y = - 1
\end{array} \right..\)
C.
\(\left\{ \begin{array}{l}
x = 2\\
y = 1
\end{array} \right..\)
D.
\(\left\{ \begin{array}{l}
x = 1\\
y = - 2
\end{array} \right..\)
A.
\(\left\{ \begin{array}{l}
x = \frac{2}{3}\\
y = 4
\end{array} \right..\)
B.
\(\left\{ \begin{array}{l}
x = - \frac{2}{3}\\
y = 4
\end{array} \right..\)
C.
\(\left\{ \begin{array}{l}
x = 2\\
y = 4
\end{array} \right..\)
D.
\(\left\{ \begin{array}{l}
x = - 2\\
y = - 4
\end{array} \right..\)
A. \(\overrightarrow {AB} = \overrightarrow {CD} .\)
B. \(\overrightarrow {AO} = \overrightarrow {OC} .\)
C. \(\overrightarrow {AD} = \overrightarrow {CB} .\)
D. \(\overrightarrow {AC} = \overrightarrow {BD} .\)
A. \(\overrightarrow {MA} + \overrightarrow {MB} = 2\overrightarrow {MI} .\)
B. \(\overrightarrow {MA} + \overrightarrow {MB} = \frac{1}{2}\overrightarrow {MI} .\)
C. \(\overrightarrow {MA} + \overrightarrow {MB} = \overrightarrow {MI} .\)
D. \(\overrightarrow {MA} + \overrightarrow {MB} = - 2\overrightarrow {MI} .\)
A. \(\overrightarrow {AB} - \overrightarrow {AC} = \overrightarrow {BC} .\)
B. \(\overrightarrow {MA} + \overrightarrow {BM} = \overrightarrow {AB} .\)
C. \(\overrightarrow {MB} - \overrightarrow {NC} = \overrightarrow {CB} .\)
D. \(\overrightarrow {AA} - \overrightarrow {BB} = \overrightarrow {AB} .\)
A. \(\cos {135^0} = 3\cos {45^0}.\)
B. \(\cos {135^0} = - \cos {45^0}.\)
C. \(\cos {135^0} = \cos {45^0}.\)
D. \(\cos {135^0} > \cos {45^0}.\)
A. \({\tan ^2}x - {\sin ^2}x = {\tan ^2}x.{\cos ^2}x.\)
B. \({\tan ^2}x - {\sin ^2}x = {\cot ^2}x.si{n^2}x.\)
C. \({\tan ^2}x - {\sin ^2}x = {\tan ^2}x.\frac{1}{{{{\sin }^2}x}}.\)
D. \({\tan ^2}x - {\sin ^2}x = {\tan ^2}x.si{n^2}x.\)
A. \(C\left( { - 5;0} \right).\)
B. \(C\left( { 5;0} \right).\)
C. \(C\left( {3;1} \right).\)
D. \(C\left( {0; - 5} \right).\)
A. \(\overrightarrow x = \left( {19;22} \right).\)
B. \(\overrightarrow x = \left( { - 19; - 22} \right).\)
C. \(\overrightarrow x = \left( { - 19;22} \right).\)
D. \(\overrightarrow x = \left( {19; - 22} \right).\)
A. \(\left| {\overrightarrow u } \right| = 1.\)
B. \(\left| {\overrightarrow u } \right| = 13.\)
C. \(\left| {\overrightarrow u } \right| = \sqrt {13} .\)
D. \(\left| {\overrightarrow u } \right| = 5.\)
A. \(\cos B = - \frac{{\sqrt 3 }}{2}.\)
B. \(\cos B = \frac{{\sqrt 3 }}{2}.\)
C. \(\cos B = \frac{{\sqrt 2 }}{2}.\)
D. \(\cos B = -\frac{{\sqrt 2 }}{2}.\)
A. \(\overrightarrow {AB} .\overrightarrow {AC} = a\sqrt 2 .\)
B. \(\overrightarrow {AB} .\overrightarrow {AC} = 2a.\)
C. \(\overrightarrow {AB} .\overrightarrow {AC} = {a^2}.\)
D. \(\overrightarrow {AB} .\overrightarrow {AC} = 2{a^2}.\)
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