y=f(x)由x^2+3y^4+x+2y=1所确定,求dy/dx
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y=f(x)由x^2+3y^4+x+2y=1所确定,求dy/dx
求函数f(x,y)=x^3-3x-4y+y^2的极值,
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)!
设f(x+y,x-y)=x^2-y^2,则f(x,y)=
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
已知f(x+y,y/x)=x^2-y^2,则f(x,y)=
f(x+y,y/x)=x^2-y^2求f(x,y)
f(x+y,y/x)=x^2-y^2,求f(x,y),详见里面
f(x+y,x-y)=2xy(x-y),求f(x,y)
已知f(x)=3^x,求证:(1)f(x)·f(y)=f(x+y);(2)f(x)/f(y)=f(x-y).
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
由f(1)=1/4,4*f(x)*f(y)=f(x+y)+f(x-y),怎么构建出的函数f(x)=1/2cos(x*π/3)?
(X,Y) f(x,y)={12y^2,0
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
设f(u)可导,函数y=y(x)由x^y+y^x=f(x^2+y^2)所确定,则dy=
f(x+y)=f(x)+f(y)+2xy
f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=?