A. a
B. a4
C. a2
D. a3
A. \(9 \pi\)
B. \(3\pi\)
C. \(\pi\)
D. \(27\pi\)
A. \(y = {x^3} - 3x + 1\)
B. \(y = - {x^4} + 2{x^2} + 1\)
C. \(y = - {x^3} + 3x + 1\)
D. \(y = {x^4} - 2{x^2} + 1\)
A. -2
B. 1
C. 3
D. -3
A. 6 + 2i
B. -2 + 4i
C. 6 - 2i
D. -2 + 2i
A. M(1;3)
B. N(3;1)
C. P(-1;3)
D. Q(-3;1)
A. \(\overrightarrow u = \left( {3;2; - 2} \right)\)
B. \(\overrightarrow u = \left( {1;2\,;\,1} \right)\)
C. \(\overrightarrow u = \left( {5\,;\, - 10;9} \right)\)
D. \(\overrightarrow u = \left( { - 1;8\,;\, - 3} \right)\)
A. \({\left( {x + 1} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z - 2} \right)^2} = 25\)
B. \({\left( {x - 1} \right)^2} + {\left( {y + 4} \right)^2} + {\left( {z + 2} \right)^2} = 5\)
C. \({\left( {x - 1} \right)^2} + {\left( {y + 4} \right)^2} + {\left( {z + 2} \right)^2} = 25\)
D. \({\left( {x + 1} \right)^2} + {\left( {y - 4} \right)^2} + {\left( {z - 2} \right)^2} = 5\)
A. \(\overrightarrow {{n_1}} \left( { - 2;3; - 3} \right)\)
B. \(\overrightarrow {{n_2}} \left( {4; - 6\,;\,6} \right)\)
C. \(\overrightarrow {{n_3}} \left( {1\,;\,2; - 1} \right)\)
D. \(\overrightarrow {{n_4}} \left( {2; - 3\,;\,3} \right)\)
A. M(-1;-1;2)
B. N(1;1;1)
C. P(3;2;1)
D. Q(3;-4;1)
A. 45o
B. 30o
C. 60o
D. 90o
A. 3
B. 1
C. 0
D. 2
A. m = -11
B. m = -3
C. m = 11
D. m = 3
A. \(f'\left( 1 \right) = \frac{1}{2}.\)
B. \(f'\left( 1 \right) = \frac{1}{{2\ln 2}}.\)
C. \(f'\left( 1 \right) = \frac{1}{{\ln 2}}.\)
D. f'(1) = 1
A. 0
B. 4
C. 3
D. 2
A. \(f(x) \ge 1 \Leftrightarrow {\log _5}{2^x}.{\log _5}{5^{{x^2}}} \ge 0\)
B. \(f(x) \ge 1 \Leftrightarrow x.{\log _5}2 + {x^2} \ge 0\)
C. \(f(x) \ge 1 \Leftrightarrow x.{\log _5}2 + 2x \ge 0\)
D. \(f(x) \ge 1 \Leftrightarrow x.{\log _5}2 + {x^2} \ge 1\)
A. \(8\pi {a^2}\)
B. \(3\pi {a^2}\)
C. \(6\pi {a^2}\)
D. \(\pi {a^2}(2\sqrt 3 + 3)\)
A. \(I = (x\cos x)\left| \begin{array}{l} \frac{\pi }{2}\\ 0 \end{array} \right. - \int\limits_0^{\frac{\pi }{2}} {\cos xdx} \)
B. \(I = ( - x\cos x)\left| \begin{array}{l} \frac{\pi }{2}\\ 0 \end{array} \right. + \int\limits_0^{\frac{\pi }{2}} {(\frac{{{x^2}}}{2}\cos x)dx} \)
C. \(I = ( - x\cos x)\left| \begin{array}{l} 1\\ 0 \end{array} \right. + \int\limits_0^1 {\cos xdx} \)
D. \(I = ( - x\cos x)\left| \begin{array}{l} \frac{\pi }{2}\\ 0 \end{array} \right. + \int\limits_0^{\frac{\pi }{2}} {\cos xdx} \)
A. \(S = \int\limits_{ - 1}^2 {f\left( x \right)\,} {\rm{d}}x\)
B. \(S = \int\limits_{ - 1}^1 {f\left( x \right)\,} {\rm{d}}x + \int\limits_1^2 {f\left( x \right)\,} {\rm{d}}x\)
C. \(S = - \int\limits_{ - 1}^1 {f\left( x \right)\,} {\rm{d}}x + \int\limits_1^2 {f\left( x \right)\,} {\rm{d}}x\)
D. \(S = \int\limits_{ - 1}^1 {f\left( x \right)\,} {\rm{d}}x - \int\limits_1^2 {f\left( x \right)\,} {\rm{d}}x\)
A. \(\frac{5}{2}\)
B. \(\sqrt 2 \)
C. \(\frac{{\sqrt {10} }}{2}\)
D. 2
A. -7
B. -3
C. 7
D. 3
A. \(\left\{ \begin{array}{l} x = 1 + t\\ y = 2\\ z = 3 \end{array} \right.\)
B. \(\left\{ \begin{array}{l} x = 1\\ y = 2\\ z = 3 + t \end{array} \right.\)
C. \(\left\{ \begin{array}{l} x = 1 + t\\ y = 2\\ z = 3 + t \end{array} \right.\)
D. \(\left\{ \begin{array}{l} x = 1\\ y = 2 + t\\ z = 3 \end{array} \right.\)
A. 7x + y + 3z + 1 = 0
B. 2x + y - 5z + 12 = 0
C. 7x + y + 3z - 1 = 0
D. 2x + y - 5z - 7 = 0
A. 150
B. 50
C. 243
D. 540
A. \(\frac{{a\sqrt {57} }}{{19}}\)
B. \(\frac{a}{2}\)
C. \(\frac{{a\sqrt {57} }}{{57}}\)
D. \(\frac{{a\sqrt {57} }}{{38}}\)
A. 2
B. 3
C. 4
D. 5
A. 210 triệu đồng
B. 220 triệu đồng
C. 212 triệu đồng
D. 216 triệu đồng
A. ad < bc < 0
B. 0 < ad < bc
C. bc < ad < 0
D. ad < 0 < bc
A. \(\frac{{\pi {a^3}}}{3}.\)
B. \(\frac{{\sqrt 3 \pi {a^3}}}{3}.\)
C. \(\sqrt 3 \pi {a^3}.\)
D. \(\frac{{\sqrt 3 \pi {a^3}}}{9}.\)
A. I = 1
B. I = 3
C. I = 2
D. I = 4
A. 5
B. 2
C. 1
D. 4
A. \(\left[ {2;\frac{5}{2}} \right)\)
B. \(\left[ {\frac{5}{2};3} \right)\)
C. \(\left[ {3;\frac{7}{2}} \right)\)
D. \(\left[ {\frac{7}{2};4} \right)\)
A. 3
B. 4
C. 7
D. 9
A. \(V = 192\sqrt 3 \)
B. \(V = 96\sqrt 3 \)
C. \(V = 64\sqrt 3 \)
D. \(V = 384\sqrt 3 \)
A. 7
B. -3
C. -2
D. 0
A. 30o
B. 45o
C. 60o
D. 90o
A. \(A = - 6 + \sqrt 7 \)
B. \(A = - \sqrt 7 \)
C. \(A = - 6 - \sqrt 7 \)
D. \(A = \sqrt 7 \)
A. \(\frac{{626}}{{25}}\)
B. 0
C. \(\frac{{26}}{{25}}\)
D. \(\frac{{26}}{5}\)
A. \(V = \frac{{10\pi }}{3}\)
B. \(V = \frac{{32\pi }}{3}\)
C. \(V = \frac{{20\pi }}{3}\)
D. \(V = \frac{{16\pi }}{3}\)
A. -6
B. 6
C. -3
D. 3
A. \(h = \frac{{a\sqrt 7 }}{3}\)
B. \(h = \frac{{a\sqrt {21} }}{7}\)
C. \(h = a\sqrt 3 \)
D. \(h = \frac{{a\sqrt 7 }}{{21}}\)
A. P = 20
B. P = 39
C. P = 125
D. P = 72
A. \(V = \frac{{9{a^3}}}{{2\sqrt 3 }}.\)
B. \(V = \frac{{2{a^3}}}{4}.\)
C. \(V = \frac{{{a^3}\sqrt 3 }}{9}.\)
D. \(V = \frac{{{a^3}}}{9}.\)
A. 2
B. 3
C. 1
D. 0
A. 6
B. 5
C. 9
D. 17
A. 4
B. 6
C. 7
D. 10
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