y=f(x) y'=y/(x+y) 求y函数的解析式

二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) f(x,y)=xy+e^x x arctanx/y ,求f(x+y,x-y) f（x+y,y/x)=x²-y².求f（x,y） f(x+y,y/x)=x^2-y^2求f(x,y) f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)! f(x+y,x-y)=2xy(x-y),求f(x,y) f(x+y,y/x)=x^2-y^2,求f(x,y),详见里面 y=f(x) y'=y/(x+y) 求y函数的解析式 求下列函数表达式：f(x+y,y/x)=x*x-y*y,求f(x+y) 设f(x+y,x-y)=x^2+y^2-x*y求f(x,y) 已知函数f(x,y,z)=arcsin(x*x+y*y+lnz)求f(x-y,x+y,xz)? f(x^2-y^2,x-y)=x+y+x^2-xy,求f'(x,y)对y求导 求y'=y/(y-x) f(x,x)=x f(x,y)=f(y,x) (x+y)f(x,y)=yf(x,x+y)求f(14,52) y'=-2xy;求f(x).y'=2y/x+2;求y y=f(x), 设y=f(x)由方程x^(1+y)=y^(sinx)确定,求y' 设f(x+y,x-y)=x^2+xy,求f(x,y)