A. \(\frac{{12}}{5}.\)
B. \(\frac{{8}}{5}.\)
C. \(-\frac{{24}}{5}.\)
D. \(\frac{{24}}{5}.\)
A. \(\overrightarrow u = \left( {2;3} \right)\)
B. \(\overrightarrow u = \left( {3;2} \right)\)
C. \(\overrightarrow u = \left( {3; - 2} \right)\)
D. \(\overrightarrow u = \left( {-3; - 2} \right)\)
A. \({d_1}:3x + 2y = 0\)
B. \({d_2}:3x - 2y = 0\)
C. \({d_3}: - 3x + 2y - 7 = 0\)
D. \({d_4}:6x - 4y - 14 = 0\)
A. \(\overrightarrow u = \left( {2; - 5} \right)\)
B. \(\overrightarrow u = \left( {5;2} \right)\)
C. \(\overrightarrow u = \left( { - 1;3} \right)\)
D. \(\overrightarrow u = \left( { - 3;1} \right)\)
A. x - 3y + 1 = 0
B. x + 3y + 3 = 0
C. x - 3y - 3 = 0
D. 3x + y + 1 = 0
A. \(I\left( {1;\,2} \right);R = 1\)
B. \(I\left( {1;\, - 2} \right);R = 3\)
C. \(I\left( {1;\, - 2} \right);R = 9\)
D. \(I\left( {2;\, - 4} \right);R = 9\)
A. \(\cos \alpha = \left| {\cos \left( {\overrightarrow {AB} ,\,\overrightarrow {CD} } \right)} \right|\)
B. \(\cos \alpha = \cos \left( {\overrightarrow {AB} ,\,\overrightarrow {CD} } \right)\)
C. \(\cos \alpha = \left| {\sin \left( {\overrightarrow {AB} ,\,\overrightarrow {CD} } \right)} \right|\)
D. \(\cos \alpha = - \left| {\cos \left( {\overrightarrow {AB} ,\,\overrightarrow {CD} } \right)} \right|\)
A. x + 2y - 8 = 0
B. x - 2y + 4 = 0
C. 2x - y - 1 = 0
D. 2x + y - 7 = 0
A. \(\left\{ \begin{array}{l} x = - 3 + 2t\\ y = 2 - t \end{array} \right.\)
B. \(\left\{ \begin{array}{l} x = 2 - 3t\\ y = - 1 + 2t \end{array} \right.\)
C. \(\left\{ \begin{array}{l} x = - 2 - 3t\\ y = 1 + 2t \end{array} \right.\)
D. \(\left\{ \begin{array}{l} x = - 2 - 3t\\ y = 1 + 2t \end{array} \right.\)
A. x - 2y - 4 = 0
B. x + y + 4 = 0
C. x + y + 4 = 0
D. - x + 2y - 4 = 0
A. \({x^2} + {y^2} + x + y + 4 = 0\)
B. \({x^2} - {y^2} + 4x - 6y - 2 = 0\)
C. \({x^2} + 2{y^2} - 2x + 4y - 1 = 0\)
D. \({x^2} + {y^2} - 4x - 1 = 0\)
A. m = 1
B. m = -2
C. m = 2
D. m tùy ý
A. (2;-6)
B. (5;2)
C. (5;-2)
D. Không có giao điểm.
A. \({a^2} + {b^2} - 4c > 0\)
B. \({a^2} + {b^2} - c > 0\)
C. \({a^2} + {b^2} - 4c \ge 0\)
D. \({a^2} + {b^2} - c \ge 0\)
A. \(\frac{{{x^2}}}{{64}} + \frac{{{y^2}}}{{36}} = 1\)
B. \(\frac{{{x^2}}}{9} + \frac{{{y^2}}}{{16}} = 1\)
C. \(9{x^2} + 16{y^2} = 1\)
D. \(\frac{{{x^2}}}{{16}} + \frac{{{y^2}}}{9} = 1\)
A. 15
B. 5
C. -3
D. -15
A. x + y + 1 = 0
B. 2x + 3y - 5 = 0
C. 3x - 2y - 1 = 0
D. 2x - 3y + 1 = 0
A. 24x + 32y - 53 = 0
B. 24x + 32y + 53 = 0
C. 24x - 32y + 53 = 0
D. 24x - 32y - 53 = 0
A. \(\left( {\frac{{14}}{5};\frac{7}{5}} \right)\)
B. \(\left( { - \frac{{14}}{5}; - \frac{7}{5}} \right)\)
C. (3;1)
D. \(\left( {\frac{5}{3};\frac{3}{2}} \right)\)
A. \(\overrightarrow u = \left( {2;\;1} \right)\)
B. \(\overrightarrow u = \left( {1;\; - 1} \right)\)
C. \(\overrightarrow u = \left( {1;\;1} \right)\)
D. \(\overrightarrow u = \left( {1;\;2} \right)\)
A. \(M\left( { - 1;\;2} \right);M\left( {4;\;3} \right)\)
B. \(M\left( { - 1;\;2} \right);M\left( {3;4} \right)\)
C. \(M\left( {1;\; - 2} \right);M\left( {3;\;4} \right)\)
D. \(M\left( {2;\; - 1} \right);M(3;4)\)
A. \(G\left( {2;\; - \frac{{11}}{3}} \right)\)
B. \(G\left( { - \frac{{11}}{3};\;2} \right)\)
C. \(G\left( {\frac{{11}}{3}; - \;2} \right)\)
D. \(G\left( { - 2;\;\frac{{11}}{3}} \right)\)
A. \(\left( {\frac{7}{6};\,\frac{{13}}{6}} \right)\)
B. \(\left( {\frac{7}{6};\, - \frac{{13}}{6}} \right)\)
C. \(\left( {\,\frac{{13}}{6};\frac{7}{6}} \right)\)
D. \(\left( { - \frac{7}{6};\,\frac{{13}}{6}} \right)\)
A. 45o
B. 60o
C. 30o
D. 135o
A. 7x - y = 0
B. x - 7y - 2 = 0
C. x + 7y - 2 = 0
D. 7x + y - 2 = 0
A. 4x - 2y + 1 = 0
B. x - 2y + 14 = 0
C. x + 2y - 14 = 0
D. x - 2y - 14 = 0
A. \(\widehat {A\,} = 45^\circ \)
B. \(\widehat {A\,} = 30^\circ \)
C. \(\widehat {A\,} = 60^\circ \)
D. \(\widehat {A\,} = 75^\circ \)
A. \(A\left( {\frac{4}{3};\frac{7}{3}} \right)\)
B. \(A\left( { - \frac{4}{3};\frac{7}{3}} \right)\)
C. \(A\left( { - \frac{4}{3}; - \frac{7}{3}} \right)\)
D. \(A\left( {\frac{4}{3}; - \frac{7}{3}} \right)\)
A. \({\left( {x + 8} \right)^2} + {\left( {y - 3} \right)^2} = 25\)
B. \({\left( {x - 2} \right)^2} + {\left( {y + 2} \right)^2} = 25\) hoặc \({\left( {x + 8} \right)^2} + {\left( {y - 3} \right)^2} = 25\)
C. \({\left( {x + 2} \right)^2} + {\left( {y - 2} \right)^2} = 25\) hoặc \({\left( {x - 8} \right)^2} + {\left( {y + 3} \right)^2} = 25\)
D. \({\left( {x - 8} \right)^2} + {\left( {y + 3} \right)^2} = 25\)
A. \({\left( {x - 2} \right)^2} + {\left( {y - 2} \right)^2} = 4\)
B. \({\left( {x - 3} \right)^2} + {\left( {y + 3} \right)^2} = 9\)
C. \({\left( {x - 2} \right)^2} + {\left( {y - 2} \right)^2} = 4\) hoặc \({\left( {x - 3} \right)^2} + {\left( {y + 3} \right)^2} = 9\)
D. \({\left( {x - 2} \right)^2} + {\left( {y - 2} \right)^2} = 4\) hoặc \({\left( {x + 3} \right)^2} + {\left( {y - 3} \right)^2} = 9\)
A. \({\left( {x - 5} \right)^2} + {\left( {y + 2} \right)^2} = 40\;\) hoặc \({\left( {x - 5} \right)^2} + {\left( {y - 8} \right)^2} = 10.\;\)
B. \({\left( {x - 5} \right)^2} + {\left( {y + 2} \right)^2} = 40.\)
C. \({\left( {x - 5} \right)^2} + {\left( {y - 8} \right)^2} = 10.\;\)
D. \({\left( {x - 5} \right)^2} + {\left( {y - 2} \right)^2} = 40\) hoặc \({\left( {x - 5} \right)^2} + {\left( {y + 8} \right)^2} = 10.\)
A. \({\left( {x - 6} \right)^2} + {y^2} = 29.\)
B. \({\left( {x - 5} \right)^2} + {y^2} = 29.\)
C. \({\left( {x - 4} \right)^2} + {y^2} = 13.\)
D. \({\left( {x - 3} \right)^2} + {y^2} = 8.\)
A. \({\left( {x - 1} \right)^2} + {\left( {y - 1} \right)^2} = 1\) hoặc \({\left( {x - 5} \right)^2} + {\left( {y - 5} \right)^2} = 25\)
B. \({\left( {x +1} \right)^2} + {\left( {y +1} \right)^2} = 1\) hoặc \({\left( {x + 5} \right)^2} + {\left( {y + 5} \right)^2} = 25.\)
C. \({\left( {x - 5} \right)^2} + {\left( {y - 5} \right)^2} = 25.\)
D. \({\left( {x - 1} \right)^2} + {\left( {y - 1} \right)^2} = 1.\)
A. \({x^2} + {y^2} - 3x-7y + 12 = 0.\)
B. \({x^2} + {y^2} - 6x-4y + 5 = 0.\)
C. \({x^2} + {y^2} - 8x-2y +7 = 0.\)
D. \({x^2} + {y^2} - 2x - 8y + 20 = 0.\)
A. \({\left( {x - 3} \right)^2} + {\left( {y + 2} \right)^2} = 25.\)
B. \({\left( {x + 3} \right)^2} + {\left( {y - 2} \right)^2} = 5.\)
C. \({\left( {x +5} \right)^2} + {\left( {y + 2} \right)^2} = 5.\)
D. \({\left( {x - 5} \right)^2} + {\left( {y - 2} \right)^2} = 25.\)
A. \({a^2} - {b^2}\, > \,c\)
B. \({a^2} + {b^2}\, > \,c\)
C. \({a^2} + {b^2} < \,c\)
D. \({a^2}\, - {b^2}\, < \,c\)
A. \(4{x^2} + {y^2} - 10x - 6y - 2 = 0.\)
B. \({x^2} + {y^2} - 2x - 8y + 20 = 0.\)
C. \({x^2} + 2{y^2} - 4x - 8y + 1 = 0.\)
D. \({x^2} + {y^2} - 4x + 6y - 12 = 0.\)
A. I(0;0)
B. I(1;0)
C. I(3;2)
D. I(1;1)
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