设f(x,y)=xy+x/y,则f(x+y,1)=( )
设f(x+y,xy)=x^2+y^2,则f(x,y)
高数题 设f(x+y,x-y)=x^2-xy,则f(x,y)=多少
设函数f(x,y)=sin(x+y),那么f(0,xy)=( )
f(x+y,xy)=x^2+y^2
设函数f(x)满足f(0)=1,且对任意x,y属于R,都有f(xy+1)=f(x)乘f(y)减f(y)减x加2.求f(x
设(X,Y)的概率密度为f(x,y)=8xy,0
f(xy)=f(x)+f(y),证明f(x/y)=f(x)-f(y)
设y=f(x)是可导函数,则y=f(1+x
设函数f(x)对一切实数x,y满足f(xy)=xf(y)+yf(x)-xy且|f(x)-x|≤1,求函数f(x).
设函数f(x)=y在(0,+∞)上是增函数,并满足f(xy)=f(x)+f(y),f(4)=1
设f(x,y)=xy+f(u,v)dudv,
设函数y=f(x)是定义在R上的函数.对任意正数x,y都有f(xy)=f(x)+f(y);当x大于1时,f(x)小于0;