A. \(6{{\rm{a}}^3}\)
B. \(18{{\rm{a}}^3}\)
C. \(9{{\rm{a}}^3}\)
D. \(3{{\rm{a}}^3}\)
A. \(\dfrac{1}{3}{R^2}h\)
B. \(\dfrac{\pi }{3}{R^2}h\)
C. \(\dfrac{4}{3}\pi {R^3}h\)
D. \(\dfrac{4}{3}\pi {R^2}h\)
A. \(r = \sqrt[3]{{12}}\)(cm)
B. \(r = 2\)(cm)
C. \(r = \sqrt {12} \)(cm)
D. \(r = 3\)(cm)
A. A. \(24\pi {a^3}\)
B. \(\dfrac{4}{3}\pi {a^3}\)
C. \(\dfrac{8}{3}\pi {a^3}\)
D. \(\dfrac{{24}}{3}\pi {a^3}\)
A. 1
B. 4
C. 0
D. 2
A. A. 33 năm
B. 41 năm
C. 50 năm
D. 10 năm
A. \({\rm{d}} = \dfrac{{2{\rm{a}}}}{{\sqrt 5 }}\)
B. \({\rm{d}} = \dfrac{{a\sqrt {57} }}{{19}}\)
C. \({\rm{d}} = \dfrac{{2a\sqrt {57} }}{{19}}\)
D. \(d = \dfrac{{a\sqrt 5 }}{2}\)
A. 2
B. 0
C. 1
D. 3
A. 300
B. 105
C. -195
D. 210
A. 2
B. 0
C. 4
D. 3
A. \(\left( {1; + \infty } \right)\)
B. \(\left( {0;3} \right)\)
C. \(\left( {3; + \infty } \right)\)
D. \(\left( { - \infty ;3} \right)\)
A. 1
B. 0
C. 10
D. Vô số
A. 16
B. 8
C. 2
D. 4
A. \(x = 1\)
B. \(y = 1\)
C. \(y = - 1\)
D. \(x = - 1\)
A. (SB,BD)
B. (SB,AB)
C. (SB,SC)
D. (SB,AC)
A. \({y_{C{\rm{D}}}} = 3\)
B. \({y_{C{\rm{D}}}} = - 1\)
C. \({y_{C{\rm{D}}}} = - 6\)
D. \({y_{C{\rm{D}}}} = 8\)
A. \(f'\left( x \right) = \dfrac{{2x}}{{{x^2} + 1}}\) B. \(f'\left( x \right) = - \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\log e}}\) C. \(f'\left( x \right) = \dfrac{1}{{\left( {{x^2} + 1} \right)\ln 10}}\) D. \(f'\left( x \right) = \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\ln 10}}\)
B. \(f'\left( x \right) = - \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\log e}}\)
C. \(f'\left( x \right) = \dfrac{1}{{\left( {{x^2} + 1} \right)\ln 10}}\)
D. \(f'\left( x \right) = \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\ln 10}}\)
A. \(x < \dfrac{3}{5}\)
B. \(x > \dfrac{5}{3}\)
C. \(x > \dfrac{3}{5}\)
D. \(x < \dfrac{5}{3}\)
A. \({\log _2}\left( {\dfrac{{2{{\rm{a}}^3}}}{b}} \right) = 1 + \dfrac{1}{3}{\log _2}a + {\log _2}b\)
B. \({\log _2}\left( {\dfrac{{2{{\rm{a}}^3}}}{b}} \right) = 1 + 3{\log _2}a + {\log _2}b\)
C. \({\log _2}\left( {\dfrac{{2{{\rm{a}}^3}}}{b}} \right) = 1 + 3{\log _2}a - {\log _2}b\)
D. \({\log _2}\left( {\dfrac{{2{{\rm{a}}^3}}}{b}} \right) = 1 + \dfrac{1}{3}{\log _2}a - {\log _2}b\)
A. \(a > c > b\)
B. \(c > a > b\)
C. \(b > c > a\)
D. \(a > b > c\)
A. \( - \dfrac{{23}}{{27}}\)
B. \(1\)
C. \( - 2\)
D. \( - \dfrac{{32}}{{27}}\)
A. \(\dfrac{{{a^3}\sqrt 3 }}{{24}}\)
B. \(\dfrac{{{a^3}\sqrt 3 }}{4}\)
C. \(\dfrac{{{a^3}\sqrt 3 }}{{12}}\)
D. \(\dfrac{{{a^3}\sqrt 3 }}{6}\)
A. \(m > - 1\)
B. \( - 1 \le m < 0\)
C. \( - 1 < m \le 0\)
D. \( - 1 < m < 0\)
A. \(288\pi \)
B. \(96\pi \)
C. \(360\pi \)
D. \(120\pi \)
A. \(12\pi {a^3}\)
B. \(36\pi {a^3}\)
C. \(\dfrac{{100\pi {a^3}}}{3}\)
D. \(16\pi {a^3}\)
A. \(y = \dfrac{{3x + 10}}{{5x + 7}}\)
B. \(y = \dfrac{{ - x + 1}}{{5x - 3}}\)
C. \(y = \dfrac{{ - x - 8}}{{x + 3}}\)
D. \(y = \dfrac{{3x + 5}}{{x + 1}}\)
A. \(V = \dfrac{{2{{\rm{a}}^3}\sqrt 2 }}{3}\)
B. \(V = \dfrac{{4{{\rm{a}}^3}\sqrt 2 }}{3}\)
C. \(V = \dfrac{{4{{\rm{a}}^3}\sqrt 3 }}{3}\)
D. \(V = \dfrac{{2{{\rm{a}}^3}\sqrt 3 }}{3}\)
A. \(D = \mathbb{R}\backslash \left\{ { - 2} \right\}\)
B. \({\rm{D}} = \left( { - 2;3} \right)\)
C. \(D = \left( { - \infty ;2} \right) \cup \left[ {3; + \infty } \right)\)
D. \({\rm{D}} = \left( { - \infty ;2} \right) \cup \left( {3; + \infty } \right)\)
A. \(\dfrac{8}{3}\)
B. \(\dfrac{7}{3}\)
C. \(\dfrac{7}{2}\)
D. 4
A. \(1 \le x \le 3\)
B. \(\left[ \begin{array}{l}x \le 1\\x \ge 2\end{array} \right.\)
C. \(1 \le x \le 2\)
D. \(\left[ \begin{array}{l}x \le 1\\x \ge 3\end{array} \right.\)
A. \({e^2} + e - 4\)
B. \({e^4} - e\)
C. \({e^4} - e - 4\)
D. \({e^4} + e\)
A. \(D = \left( {2; + \infty } \right)\)
B. \(D = \left( {3; + \infty } \right)\)
C. \(D = \left( {2;3} \right)\)
D. \(D = \left( {2; + \infty } \right)\backslash \left\{ 3 \right\}\)
A. \(y = 9x + 18\)
B. \(y = 9x - 22\)
C. \(y = 9x - 18\)
D. \(y = - 9x - 18\)
A. Vô số
B. 2
C. 1
D. 3
A. \(27c{m^3}\)
B. \(81c{m^3}\)
C. \(9c{m^3}\)
D. \(36c{m^3}\)
A. \(V = 384\)
B. \(V = 180\)
C. \(V = 480\)
D. \(V = 288\)
A. \(\dfrac{{{a^3}\sqrt 3 }}{8}\)
B. \(\dfrac{{{a^3}\sqrt 3 }}{3}\)
C. \(\dfrac{{{a^3}\sqrt 2 }}{8}\)
D. \(\dfrac{{{a^3}\sqrt 3 }}{{24}}\)
A. 2
B. 1
C. 4
D. 3
A. \(m \in \left[ { - 4;0} \right]\)
B. \(m \in \left( { - 4;4} \right)\)
C. \(m \in \left( { - \infty ; - 10} \right] \cup \left( {4; + \infty } \right)\)
D. \(m \in \left[ {0;4} \right)\)
A. 1
B. 4
C. 3
D. 2
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