f(x,y,z)=In{[x^α+z^(1-α-β)]/y^β}+x/z+(z/x)^β,求 ∂f(x,y,
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
分解因式:f(x,y,z)=x^2(y-z)+y^2(z-x)+z^2(x-y)
在概率论中,如何根据f(x,y)求f(z)(Z=|X+Y|或者Z=|X-Y|)
u=f(x-y,y-z,t-z)
(x+y-z)(x-y+z)=
3道高数题,1,函数F(x,y,z)=(e^x) * y * (z^2) ,其中z=z(x,y)是由x+y+z+xyz=
设函数f可微,z=f(ye^x,x/(y^2)) 求z/x,z/y
z=f(x*x-y*y,e的XY次方)求Z对X偏导 Z对Y偏导
设Z=f(xz,z/y)确定Z为x,y的函数求dz
已知x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求代数式x2/(y+z)+y2/(x+z)+z2/
已知实数x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求x2/(y+z)+y2/(z+x)+z2/(
x+y+z=1 求xyz/(x+y)(y+z)(z+x)的最大值