\(\int_{-\sqrt{2}}^{\sqrt{2}}{\sqrt{8-2 { { y}^{2}}}dy}\)=( )。 A: \(\sqrt{2}(\pi -2)\) B: \(\sqrt{2}(\pi +2)\) C: \(2\sqrt{2}(\pi +2)\) D: \(2\sqrt{2}(\pi -2)\)
\(\int_{-\sqrt{2}}^{\sqrt{2}}{\sqrt{8-2 { { y}^{2}}}dy}\)=( )。 A: \(\sqrt{2}(\pi -2)\) B: \(\sqrt{2}(\pi +2)\) C: \(2\sqrt{2}(\pi +2)\) D: \(2\sqrt{2}(\pi -2)\)
内接于半径为a的球且体积最大的长方体的长、宽、高分别为( )。 A: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) B: \( (\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }}) \) C: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) D: \( (\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }}) \)
内接于半径为a的球且体积最大的长方体的长、宽、高分别为( )。 A: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) B: \( (\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }}) \) C: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) D: \( (\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }}) \)
from math import sqrt print(sqrt(3)*sqrt(3) == 3)本题的输出结果是( ) A: 3 B: True C: False D: sqrt(3)*sqrt(3) == 3
from math import sqrt print(sqrt(3)*sqrt(3) == 3)本题的输出结果是( ) A: 3 B: True C: False D: sqrt(3)*sqrt(3) == 3
函数$f(x,y)=\sqrt{1+{{y}^{2}}}\cos x$在点$(0,1)$处的1次Taylor多项式为 A: $\sqrt{2}-\frac{1}{\sqrt{2}}(y-1)$ B: $\frac{\sqrt{2}}{2}+\frac{1}{\sqrt{2}(}y-1)$ C: $2\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$ D: $\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$
函数$f(x,y)=\sqrt{1+{{y}^{2}}}\cos x$在点$(0,1)$处的1次Taylor多项式为 A: $\sqrt{2}-\frac{1}{\sqrt{2}}(y-1)$ B: $\frac{\sqrt{2}}{2}+\frac{1}{\sqrt{2}(}y-1)$ C: $2\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$ D: $\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$
以下程序代码的执行结果是( ) from math import sqrt print(sqrt(3)*sqrt(3)==3) A: 3 B: True C: False D: sqrt(3)*sqrt(3)==3
以下程序代码的执行结果是( ) from math import sqrt print(sqrt(3)*sqrt(3)==3) A: 3 B: True C: False D: sqrt(3)*sqrt(3)==3
(4)$A$矢量的方向余弦(与三个坐标轴的夹角余弦)的大小是: A: $cos\alpha=3/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ B: $cos\alpha=4/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ C: $cos\alpha=2/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ D: $cos\alpha=3/\sqrt{14},cos\beta=9/\sqrt{14},cos\gamma=3/\sqrt{14}$
(4)$A$矢量的方向余弦(与三个坐标轴的夹角余弦)的大小是: A: $cos\alpha=3/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ B: $cos\alpha=4/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ C: $cos\alpha=2/\sqrt{14},cos\beta=-1/\sqrt{14},cos\gamma=3/\sqrt{14}$ D: $cos\alpha=3/\sqrt{14},cos\beta=9/\sqrt{14},cos\gamma=3/\sqrt{14}$
求函数$y = \root 3 \of {x + \sqrt x } $的导数$y' = $( ) A: ${{1 + 2\sqrt x } \over {\root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ B: $ {{1 + 2\sqrt x } \over {6\root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ C: $ {{1 + 2\sqrt x } \over {6\sqrt x \cdot \root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ D: $ {{1 + 2\sqrt x } \over {\sqrt x \cdot \root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$
求函数$y = \root 3 \of {x + \sqrt x } $的导数$y' = $( ) A: ${{1 + 2\sqrt x } \over {\root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ B: $ {{1 + 2\sqrt x } \over {6\root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ C: $ {{1 + 2\sqrt x } \over {6\sqrt x \cdot \root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$ D: $ {{1 + 2\sqrt x } \over {\sqrt x \cdot \root 3 \of {{{\left( {x + \sqrt x } \right)}^2}} }}$
执行下列语句后的显示结果是什么? >>> from math import sqrt >>> print sqrt(3)sqrt(3) == 3() A: 3 B: True C: False D: sqrt(3)sqrt(3) == 3
执行下列语句后的显示结果是什么? >>> from math import sqrt >>> print sqrt(3)sqrt(3) == 3() A: 3 B: True C: False D: sqrt(3)sqrt(3) == 3
设a和b分别为Matlab中定义的1&times8的行向量,则计算a,b向量余弦夹角的命令是( )。 A: a*b'/(sqrt(a*a')*sqrt(b*b')) B: a'*b'/sqrt(a'*a')*sqrt(b'*b') C: a'*b/sqrt(a'*a)*sqrt(b'*b) D: a'*b/(sqrt(a'*a)*sqrt(b'*b))
设a和b分别为Matlab中定义的1&times8的行向量,则计算a,b向量余弦夹角的命令是( )。 A: a*b'/(sqrt(a*a')*sqrt(b*b')) B: a'*b'/sqrt(a'*a')*sqrt(b'*b') C: a'*b/sqrt(a'*a)*sqrt(b'*b) D: a'*b/(sqrt(a'*a)*sqrt(b'*b))
题目08. 在\(\mathbb{R}^2\)中,先平移\([1,1]^T\),再旋转\(\frac{\pi}{3}\),在伸长2倍的映射是: A: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}x+\sqrt{3}y+1-\sqrt{3}\\ \sqrt{3}x-y+1+\sqrt{3}\end{pmatrix}\) B: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}x-\sqrt{3}y+1-\sqrt{3}\\ \sqrt{3}x+y+1+\sqrt{3}\end{pmatrix}\) C: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}\sqrt{3}x+y+1-\sqrt{3}\\ x-\sqrt{3}y+1+\sqrt{3}\end{pmatrix}\) D: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix} \sqrt{3}x-y+1-\sqrt{3}\\ x+\sqrt{3}y+1+\sqrt{3}\end{pmatrix}\)
题目08. 在\(\mathbb{R}^2\)中,先平移\([1,1]^T\),再旋转\(\frac{\pi}{3}\),在伸长2倍的映射是: A: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}x+\sqrt{3}y+1-\sqrt{3}\\ \sqrt{3}x-y+1+\sqrt{3}\end{pmatrix}\) B: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}x-\sqrt{3}y+1-\sqrt{3}\\ \sqrt{3}x+y+1+\sqrt{3}\end{pmatrix}\) C: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}\sqrt{3}x+y+1-\sqrt{3}\\ x-\sqrt{3}y+1+\sqrt{3}\end{pmatrix}\) D: \(f\begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix} \sqrt{3}x-y+1-\sqrt{3}\\ x+\sqrt{3}y+1+\sqrt{3}\end{pmatrix}\)