A.\[V = \pi \mathop \smallint \limits_a^b \left| {f\left( x \right)} \right|dx\]
B. \[V = \mathop \smallint \limits_a^b \left| {f\left( x \right)} \right|dx\]
C. \[V = \pi \mathop \smallint \limits_a^b {f^2}\left( x \right)dx\]
D. \[V = {\pi ^2}\mathop \smallint \limits_a^b {f^2}\left( x \right)dx\]
A.\[V = {\pi ^2}\mathop \smallint \limits_0^1 {x^3}dx\]
B. \[V = \pi \mathop \smallint \limits_0^1 {x^3}dx\]
C. \[V = \pi \mathop \smallint \limits_0^1 {x^6}dx\]
D. \[V = \pi \mathop \smallint \limits_0^1 {x^5}dx\]
A.\[V = {\pi ^2}\mathop \smallint \limits_0^1 {x^4}dx\]
B. \[V = \pi \mathop \smallint \limits_0^1 {y^2}dy\]
C. \[V = \pi \mathop \smallint \limits_0^1 {y^4}dy\]
D. \[V = \pi \mathop \smallint \limits_0^1 - {y^4}dy\]
A.\[\frac{{81\pi }}{{35}}\]
B. \[\frac{{53\pi }}{6}\]
C. \[\frac{{81}}{{35}}\]
D. \[\frac{{21\pi }}{5}\]
A.\[V = 4 - 2e\]
B. \[V = \left( {4 - 2e} \right)\pi \]
C. \[V = {e^2} - 5\]
D. \[V = \left( {{e^2} - 5} \right)\pi \]
A.\[\frac{2}{5}\pi \]
B. \(\pi \)
C. \[\frac{1}{2}\pi \]
D. \[\frac{8}{{15}}\pi \]
A.\[a = 2\sqrt 2 \]
B. \[a = \frac{5}{2}\]
C. \[a = 2\]
D. \[a = 3\]
A.\[V = \pi \mathop \smallint \limits_a^b \left( {f_1^2(x) - f_2^2(x)} \right)dx\]
B. \[V = \pi \mathop \smallint \limits_a^b \left( {{f_1}(x) - {f_2}(x)} \right)dx\]
C. \[V = \mathop \smallint \limits_a^b \left( {f_1^2(x) - f_2^2(x)} \right)dx\]
D. \[V = \pi \mathop \smallint \limits_a^b {\left( {{f_1}(x) - {f_2}(x)} \right)^2}dx\]Trả lời:
A.\[V = \pi \mathop \smallint \limits_0^2 (2 - x)dx + \pi \mathop \smallint \limits_0^2 {x^2}dx\]
B. \[V = \pi \mathop \smallint \limits_0^2 (2 - x)dx\]
C. \[V = \pi \mathop \smallint \limits_0^1 xdx + \pi \mathop \smallint \limits_1^2 \sqrt {2 - x} dx\]
D. \[V = \pi \mathop \smallint \limits_0^1 {x^2}dx + \pi \mathop \smallint \limits_1^2 (2 - x)dx\]
A.\[V = \mathop \smallint \limits_a^b S\left( x \right)dx\]
B. \[V = \pi \mathop \smallint \limits_a^b S\left( x \right)dx\]
C. \[V = \mathop \smallint \limits_a^b {S^2}\left( x \right)dx\]
D. \[V = \pi \mathop \smallint \limits_a^b {S^2}\left( x \right)dx\]
A.\[V = \mathop \smallint \limits_{ - 2}^0 4{x^4}dx\]
B. \[V = \mathop \smallint \limits_0^{ - 2} 2{x^2}dx\]
C. \[V = \mathop \smallint \limits_{ - 2}^0 2{x^2}dx\]
D. \[V = \pi \mathop \smallint \limits_{ - 2}^0 4{x^4}dx\]
A.\[V = 32 + 2\sqrt {15} \]
B. \[V = \frac{{124\pi }}{3}\]
C. \[V = \frac{{124}}{3}\]
D. \[V = (32 + 2\sqrt {15} )\pi \]
A.T=6.
B.T=9.
C.T=12.
D.T=3.
A.\[V = 3.\]
B. \[V = \frac{\pi }{3}.\]
C. \[V = \pi .\]
D. \[V = 3\pi .\]
A.\[a \in \left( {\frac{1}{2};1} \right).\]
B.\[a \in \left( {1;\frac{3}{2}} \right).\]
C. \[a \in \left( {\frac{3}{2};2} \right).\]
D. \[a \in \left( {2;\frac{5}{2}} \right).\]
A.\[V = \frac{7}{3}\pi .\]
B. \[V = \frac{8}{3}\pi .\]
C. \[V = \frac{{10}}{3}\pi .\]
D. \[V = \frac{{16}}{3}\pi .\]
A.\[V = 36\pi .\]
B. \[V = 24\pi .\]
C. \[V = 16\pi .\]
D. \[V = 64\pi .\]
A.T=33.
B.T=31.
C.T=29.
D.T=27.
A.\[V = 6{\pi ^2}.\]
B. \[V = 4{\pi ^2}.\]
C. \[V = 2{\pi ^2}.\]
D. \[V = 8{\pi ^2}.\]
A.\[\frac{4}{3}\]
B. \[\frac{{2\sqrt 3 }}{3}\]
C. \[\frac{2}{3}\]
D. \[\frac{{\sqrt 6 }}{3}\]
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