A. \(a<0\,;\,c<0\).
B. \(a<0\,;\,c>0\).
C. \(a>0\,;\,c>0\).
D. \(a>0\,;\,c<0\).
A. 6
B. 8
C. 5
D. 36
A.
\(S=48\pi \,\left( d{{m}^{2}} \right)\).
B.
\(S=51\pi \,\left( d{{m}^{2}} \right)\).
C. \(S = 144\pi \left( {d{m^2}} \right)\)
D. \(S=66\pi \,\left( d{{m}^{2}} \right)\).
A. 2
B. 3
C. 1
D. 4
A. a = 4
B. a = 1
C. a = 0
D. a = 3
A.
\(\frac{{{a}^{3}}\sqrt{3}}{2}\).
B.
\(\frac{{{a}^{3}}}{3}\)
C. \(\frac{2{{a}^{3}}}{3}\).
D. \(\frac{2{{a}^{3}}\sqrt{2}}{3}\).
A. \(\frac{80\pi }{3}\).
B. \(48\pi \).
C. \(\frac{16\pi }{3}\).
D. \(16\pi \).
A. 60
B. 220
C. 360
D. 120
A. \(\left( -\infty ;1 \right]\cup \left[ 4;+\infty \right)\).
B.
\(\left( -\infty ;1 \right]\cup \left[ 16;+\infty \right)\)
C.
\(\left( -\infty ;2 \right]\cup \left[ 16;+\infty \right)\).
D. \(\left( -\infty ;2 \right]\cup \left[ 4;+\infty \right)\).
A.
\(\left( 3\,;\,+\infty \right)\).
B.
\(\left( -\infty \,;\,3 \right)\).
C. \(\left( 2\,;\,3 \right)\).
D. \(\left( -\infty \,;\,1 \right)\).
A.
\(x=\pi +k2\pi ;\,\,k\in \mathbb{Z}\).
B.
\(x=\pi +k\pi ;\,\,k\in \mathbb{Z}\).
C. \(x=k\pi ;\,\,k\in \mathbb{Z}\).
D. \(x=k2\pi ;\,\,k\in \mathbb{Z}\).
A.
Hàm số \(y=\cos x\) là hàm số lẻ.
B.
Hàm số \(y=\cot 2x\) và hàm số \(y=\cot x\) là các hàm số lẻ.
C.
Hàm số \(y=\tan x\) là hàm số lẻ.
D. Hàm số \(y=\sin x\) là hàm số lẻ.
A. \(\frac{5}{3}\).
B. -1.
C. \(-\frac{1}{3}\).
D. \(\frac{2}{3}\).
A.
\(\frac{{{a}^{3}}\sqrt{3}}{6}\).
B.
\(\frac{{{a}^{3}}\sqrt{3}}{3}\).
C. \(\frac{{{a}^{3}}\sqrt{3}}{2}\).
D. \(\frac{{{a}^{3}}\sqrt{3}}{4}\).
A. \(-\frac{28}{3}\).
B. -9
C. -10
D. -1
A. 4
B. 3
C. 5
D. 8
A.
\({{\left( x-8 \right)}^{-3}}>{{\left( x-8 \right)}^{-4}}\).
B.
\({{\left( {{x}^{2}} \right)}^{3}}<{{x}^{5}}\).
C.
\({{\left( \frac{x}{6} \right)}^{4}}>{{\left( \frac{x}{6} \right)}^{3}}\).
D. \({{\left( \frac{1}{x} \right)}^{-3}}<{{\left( \frac{1}{x} \right)}^{-2}}\)
A.
\({{S}_{xq}}=18\pi \left( c{{m}^{\text{2}}} \right)\).
B.
\({{S}_{xq}}=36\pi \left( c{{m}^{\text{2}}} \right)\).
C.
\({{S}_{xq}}=72\pi \left( c{{m}^{\text{2}}} \right)\).
D. \({{S}_{xq}}=9\pi \left( c{{m}^{\text{2}}} \right)\).
A.
\(\left\{ -6\,;\,-3 \right\}\)
B.
\(\left\{ 3\,;\,6 \right\}\).
C.
\(\left\{ -6\,;\,3 \right\}\).
D. \(\left\{ -3\,;\,6 \right\}\).
A.
\({{S}_{xq}}=18\pi \left( c{{m}^{\text{2}}} \right)\).
B.
\({{S}_{xq}}=36\pi \left( c{{m}^{\text{2}}} \right)\).
C.
\({{S}_{xq}}=72\pi \left( c{{m}^{\text{2}}} \right)\).
D. \({{S}_{xq}}=9\pi \left( c{{m}^{\text{2}}} \right)\).
A. 6
B. -6
C. 4
D. -4
A. 480
B. 210
C. 840
D. 180
A. 0
B. 1
C. 2
D. 3
A. \(\frac{a\sqrt{3}}{2}\)
B. \(\frac{a\sqrt{3}}{3}\)
C. \(\frac{a\sqrt{3}}{4}\)
D. \(\frac{a\sqrt{3}}{6}\)
A. \({{a}^{-{{\log }_{a}}2}}=\frac{1}{2}\)
B. \({{\log }_{{{a}^{3}}}}a=3\)
C. \({{3}^{{{\log }_{3}}a}}=a\)
D. \({{\log }_{a}}{{a}^{2}}=2\)
A. \(\frac{{{a}^{3}}\sqrt{3}}{2}\)
B. \(\frac{{{a}^{3}}\sqrt{3}}{6}\)
C. \({{a}^{3}}\)
D. \(\frac{{{a}^{3}}}{3}\)
A. \(\left( 1;-3 \right)\)
B. \({{x}_{CD}}=-1\)
C. \({{x}_{CD}}=1\)
D. \(\left( -1;5 \right)\)
A. \(\frac{5a\sqrt{3}}{3}\)
B. \(\frac{5a\sqrt{2}}{3}\)
C. \(\frac{5a\sqrt{3}}{2}\)
D. \(\frac{5a\sqrt{2}}{2}\)
A. \(y={{x}^{3}}-3x+2\)
B. \(y=-2{{x}^{3}}+3{{x}^{2}}-1\)
C. \(y={{x}^{4}}-2{{x}^{2}}-1\)
D. \(y=-{{x}^{4}}+4{{x}^{2}}\)
A. 20
B. 12
C. 24
D. 8
A. 96
B. 196
C. 97
D. 197
A. \(\left( -\frac{3}{2};0 \right)\)
B. \(\left( 2;\frac{7}{2} \right)\).
C. \(\left( -\frac{5}{2};-1 \right)\).
D. \(\left( \frac{1}{2};2 \right)\)
A. \(\frac{a}{3}\).
B. \(\frac{2a\sqrt{2}}{3}\).
C. \(\frac{a\sqrt{2}}{3}\).
D. \(\frac{2a}{3}\).
A. m = 10
B. m = 6
C. m = 12
D. m = 8
A. 15
B. 17
C. 14
D. 16
A. \(109,161\)triệu đồng.
B. \(110,034\)triệu đồng.
C. \(110,914\)triệu đồng.
D. \(109,6\)triệu đồng.
A. \(\frac{8000\sqrt{3}}{\pi }\left( c{{m}^{3}} \right)\).
B. \(\frac{6825}{4\pi }\left( c{{m}^{3}} \right)\).
C. \(\frac{6825}{2\pi }\left( c{{m}^{3}} \right)\).
D. \(\frac{4000\sqrt{3}}{\pi }\left( c{{m}^{3}} \right)\).
A. -4
B. -2
C. -5
D. -1
A. 2015
B. 2018
C. 2017
D. 2016
A. 2017
B. 2019
C. 2018
D. 0
A. \(L=\frac{3}{4}\).
B. \(L=\frac{3}{2}\).
C. \(L=\frac{1}{2}\).
D. \(L=\frac{1}{4}\)
A. \(y=2x-6\)
B. \(y=4x-6\)
C. \(y=2x-2\)
D. \(y=4x-8\)
A. \(\frac{\sqrt{7}}{3}\).
B. \(\frac{\sqrt{2}}{3}\).
C. \(\frac{\sqrt{6}}{3}\).
D. \(\frac{\sqrt{3}}{3}\)
A. \(\frac{27}{4}\).
B. \(\frac{27}{2}\)
C. \(\frac{45}{2}\)
D. \(\frac{45}{4}\)
A. 6
B. \(3\sqrt{3}\)
C. \(2\sqrt{3}\)
D. 2
A. 6
B. 7
C. 9
D. 8
A. \(4{{a}^{3}}\).
B. \(2{{a}^{3}}\).
C. \(6{{a}^{3}}\).
D. \(8{{a}^{3}}\).
A. 64
B. 40
C. 32
D. 52
A. \(\frac{35}{972}\)
B. \(\frac{25}{972}\)
C. \(\frac{45}{972}\)
D. \(\frac{55}{972}\)
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