参考答案：
x2yxy
1.dZ/dx=(e+30xe)/(e+e).
2222
2.Z''x=(mcosy-tsiny)/(m+t),Z''y=-x(msiny+tcosy)/(m+v).
3.dz/dx=6xf''u+e^xf''v，dz/dy=-20yf''u.
4.Z''x=6xf1''+5f2''，Z''y=-2yf1''+10f2''.
22
5.?z/?x=-10yz/(3z+10xy)，?z/?y=-10xz/(3z+10xy).
6.?z/?y=10y/3.
2222
7.?z/?x=(15x-3yz)/(3xy-3z),?z/?y=(3y-3xz)/(3xy-3z).
8.?z/?x=y/(1+lnz)，?z/?y=(x+5)/(1+lnz).
xyzxyzxyz
9.?u/?x=5+yze,?u/?y=(1/3)cos(y/3)+xze,?u/?z=xye.
10.
2222
?u/?x=yz(1+6x)e^(3x+10y+5z),
2222
?u/?y=xz(1+20y)e^(3x+10y+5z),
2222
?u/?z=xz(1+10z)e^(3x+10y+5z).
|
|
