A. \(A_{20}^3\)
B. \(C_{20}^3\)
C. 320
D. 60
A. 4
B. 2
C. -2
D. -4
A. x = 4
B. x = 3
C. x = 6
D. x = 7
A. 288
B. 64
C. 192
D. 96
A. \(D = \left( {\frac{1}{2};1} \right)\)
B. \(D = \left( { - \infty ;\frac{1}{2}} \right)\)
C. \(D = \left( {\frac{1}{2}; + \infty } \right)\)
D. \(D = R\backslash \left\{ {\frac{1}{2}} \right\}\)
A. \(\int\limits_a^b {kf\left( x \right){\rm{d}}x} = k\int\limits_a^b {f\left( x \right){\rm{d}}x} \)
B. \(\int\limits_a^b {\left[ {f\left( x \right) + g\left( x \right)} \right]{\rm{d}}x} = \int\limits_a^b {f\left( x \right){\rm{d}}x} + \int\limits_a^b {g\left( x \right){\rm{d}}x} \)
C. \(\int\limits_a^b {f\left( x \right){\rm{.g}}\left( x \right){\rm{d}}x} = \int\limits_a^b {f\left( x \right){\rm{d}}x.} \int\limits_a^b {g\left( x \right){\rm{d}}x} \)
D. \(\int\limits_a^b {f\left( x \right){\rm{d}}x} = - \int\limits_b^a {f\left( x \right){\rm{d}}x} \)
A. 2
B. -2
C. 3
D. 4
A. \(4\pi {r^2}\)
B. \(\pi {r^2}\)
C. \(\frac{{4\pi {r^3}}}{3}\)
D. \(\frac{1}{3}\pi {r^3}\)
A. \(2\pi rh\)
B. \(\frac{1}{3}\pi rh\)
C. \(\pi r\sqrt {{h^2} + {r^2}} \)
D. \(2\pi r\sqrt {{h^2} + {r^2}} \)
A. \(\left( { - \infty ; - 1} \right)\)
B. (-1;1)
C. \(\left( { - 1; + \infty } \right)\)
D. \(( - \infty ;1)\)
A. 2ah
B. 4ah
C. \(4a\sqrt {{h^2} + {a^2}} \)
D. \(2a\sqrt {{h^2} + {a^2}} \)
A. \(y = {x^4} - 3{x^2} + 1\)
B. \(y = {x^3} - 3x + 1\)
C. \(y = {x^2} - 3x + 1\)
D. \(y = - {x^3} + 3x + 1\)
A. 3
B. 2
C. 1
D. 4
A. \(\left[ {2; + \infty } \right)\)
B. \(\left( { - \infty ;1} \right) \cup \left( {1;2} \right]\)
C. \(\left( { - \infty ;1} \right) \cup \left[ {2; + \infty } \right)\)
D. (1;2]
A. \(\frac{{{3^x}}}{{\ln 3}} - \cos 2x + C\)
B. \(\frac{{{3^x}}}{{\ln 3}} - \frac{1}{2}\cos 2x + C\)
C. \(\frac{{{3^x}}}{{\ln 3}} + \frac{1}{2}\cos 2x + C\)
D. \({3^x}\ln 3 - \frac{1}{2}\cos 2x + C\)
A. 17
B. 22
C. -19
D. -13
A. Q(1;2)
B. P(-1;-2)
C. N(1;-2)
D. M(-1;2)
A. (0;1;0)
B. (2;1;0)
C. (0;-1;1)
D. (0;0;-1)
A. (-2;4;-1)
B. (2;-4;1)
C. (2;4;1)
D. (-2;-4;-1)
A. \(\overrightarrow {{n_3}} = \left( {2;3;2} \right)\)
B. \(\overrightarrow {{n_1}} = \left( {2;3;1} \right)\)
C. \(\overrightarrow {{n_2}} = \left( {2;3;0} \right)\)
D. \(\overrightarrow {{n_4}} = \left( {2;0;3} \right)\)
A. \(\overrightarrow u \left( { 1\,;\,2\,;\, - 1\,} \right)\)
B. \(\overrightarrow u \left( { - 1;\, - 2\,;\,1\,} \right)\)
C. \(\overrightarrow u \left( { - 2;\,3\,;\, - 1\,} \right)\)
D. \(\overrightarrow u \left( { - 2;\, - 3\,;\,1\,} \right)\)
A. 30o
B. 60o
C. 45o
D. 90o
A. 3
B. 0
C. 2
D. 1
A. 2
B. -23
C. 1
D. -7
A. \({\log _2}{a^2} = 2{\log _2}\left( { - a} \right)\)
B. \({\log _2}{a^2} = 2{\log _2}a\)
C. \({\log _2}{a^2} = - 2{\log _2}a\)
D. \({\log _2}{a^2} = 2a\)
A. 3
B. 0
C. 2
D. 1
A. [1;4)
B. (1;4]
C. \(\left( {1\,;\, + \infty } \right)\)
D. \(\left[ {1\,;\, + \infty } \right)\)
A. \(I = \int\limits_3^2 {\sqrt t {\rm{dt}}} \)
B. \(I = \int\limits_2^3 {\sqrt t {\rm{dt}}} \)
C. \(I = 2\int\limits_3^2 {\sqrt t {\rm{dt}}} \)
D. \(I = \int\limits_0^{\frac{\pi }{2}} {\sqrt t {\rm{dt}}} \)
A. \(V = \pi \int\limits_0^{\ln 4} {{{\left( {x{e^x}} \right)}^2}dx} \)
B. \(V = \pi \int\limits_0^{\ln 4} {x{e^x}dx} \)
C. \(V = \int\limits_0^{\ln 4} {\sqrt {x{e^x}} dx} \)
D. \(V = \int\limits_0^{\ln 4} {x{e^x}dx} \)
A. \(\frac{{aa' + bb'}}{{a{'^2} + b{'^2}}}\)
B. \(\frac{{aa' + bb'}}{{{a^2} + {b^2}}}\)
C. \(\frac{{aa' - bb'}}{{a{'^2} + b{'^2}}}\)
D. \(\frac{{aa' - bb'}}{{{a^2} + {b^2}}}\)
A. -i
B. -1
C. 2
D. -2i
A. x + y - z + 6 = 0
B. x + y - z + 12 = 0
C. x + y - z - 12 = 0
D. x + y - z - 6 = 0
A. \(\left\{ \begin{array}{l} x = 2 + u\\ y = 3 + 4u\\ z = 2 - 2u \end{array} \right.\)
B. \(\left\{ \begin{array}{l} x = 2 + u\\ y = 3 - 4u\\ z = 2 - 2u \end{array} \right.\)
C. \(\left\{ \begin{array}{l} x = 2 - u\\ y = 3 + 4u\\ z = 2 - 2u \end{array} \right.\)
D. \(\left\{ \begin{array}{l} x = 2 + u\\ y = 3 + 4u\\ z = 2 + 2u \end{array} \right.\)
A. \(\frac{1}{{210}}\)
B. \(\frac{1}{{600}}\)
C. \(\frac{1}{{300}}\)
D. \(\frac{1}{{450}}\)
A. \(\sin \varphi = \frac{{\sqrt 3 }}{2}\)
B. \(\sin \varphi = \frac{1}{4}\)
C. \(\sin \varphi = \frac{1}{2}\)
D. \(\sin \varphi = \frac{{\sqrt 2 }}{2}\)
A. 4
B. 6
C. 7
D. 5
A. 145037058,3 đồng
B. 55839477,69 đồng
C. 126446597 đồng
D. 111321563,5 đồng
A. 2012
B. 2013
C. 4028
D. 4026
A. \(V = \frac{{\pi {a^3}\sqrt 2 }}{6}\)
B. \(V = \pi {a^3}\sqrt 2 \)
C. \(V = \frac{{\pi {a^3}\sqrt 2 }}{2}\)
D. \(V = \frac{{\pi {a^3}\sqrt 2 }}{3}\)
A. \(f\left( 2 \right) = \frac{3}{4}\)
B. \(f\left( 2 \right) = 2\)
C. \(f\left( 2 \right) = \frac{5}{4}\)
D. \(f\left( 2 \right) = \frac{9}{4}\)
A. (0;1)
B. [0;1)
C. [1;3]
D. (4;5]
A. 0
B. 1
C. 3
D. 2
A. \(\frac{{11}}{{18}}.\)
B. \(\frac{{7}}{{18}}.\)
C. \(\frac{8}{9}.\)
D. \(\frac{5}{9}.\)
A. 0
B. 1
C. 3
D. 2
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