设z=f(x,v) ,v=v(x,y) ,其中f,v具有一阶连续偏导数,则( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/64ca8940dd6e4835901f2da3b85b7607.png
http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/ace9444b5df3444b9d46f0dc472b7e60.png
举一反三
- 设x=x(y,z),y=y(x,z),z=z(x,y)都是由方程F(x,y,z)=0所确定的具有连续偏导数的函数,则。()http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/218aa0809999447dad3d95dbfeb8067f.png
- 设函数f(u,v)具有二阶连续偏导数,z=f(x,xy),则∂2z/∂x∂y=______.
- 设f(u,v)一阶连续可偏导,f(tx,ty)=t3f(x,y),且f"x(1,2)=1,f"y(1,2)=4,则f(1,2)=______.
- 设f(u,v)一阶连续可偏导,f(tx,ty)=t3f(x,y),且f"1(1,2)=1,f"2(1,2)=4,则f(1,2)=___________。
- 设方程F(x-z,y-z)=0确定了函数z=z(x,y),F(u,v)具有连续偏导数,且F′u+F′u≠0,则() A: 0 B: 1 C: -1 D: z
内容
- 0
下列程序的输出结果是( ) void f(int v,int w) { int t; t=v;v=w;w=t; } int main() { int x=1,y=3;z=2; if(x>y) f(x,y); else if(y>z) f(y,z); else f(x,z); printf(“%d,%d,%d\n”,x,y,z); }
- 1
图像f(x,y)的离散fourier变换为F(u,v),则其Fourier频谱是 A: F(u,v) B: |F(u,v)| C: |F(u,v)|.^2 D: f(x,y)
- 2
设f(u,v)是二元可微函数,z=f(y/x,x/y),则x∂z/∂x-y∂z/∂y=____。
- 3
设 有连续的偏导数, 且 ,则 =( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/63eb2ad0bac447489cbf8cbb923d3692.png
- 4
设f(x)连续函数,则=( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/d61df8d810544f27ada3ecb86c2d853a.png