原图像是y=f(x),那y=f(2-x)这个图像怎么变?

原图像是y=f(x),那y=f(2-x)这个图像怎么变? 函数f(x/y)和f(x+y)f(x/y)=f(x)/f(y),f(x+y)=f(x)+f(y)别人说是错的那f(x/y)和f(x+y)应该=什么啊? f(x+y)=f(x)+f(y)+2xy 函数f(x+y)=f(x)+f(y)函数f(x/y)能转换成f(x/y)=f(x)-f(y)那f(x+y)=f(x)+f(y)能不能这样写? f(x+Y)+f(x-y)=2f(x)f(Y) 求其是偶函数 急 求证f（x+y）+f(x-y)=2f(x)f(y)是周期函数 f(xy)=f(x)+f(y),证明f(x/y)=f(x)-f(y) 证f(x+y)+f(x-y)=2f(x)f(y)为偶函数能否取-y?f(x+y)+f(x-y)=2f(x)f(y)取-y即把y换成-yf(x+y)+f(x-y)=2f(x)f(-y)比较两式得f(y)=f(-y)所以为偶函数?那为什么书上不这么证 设f(x)=e的y次方,证明：（1）,f(x)f(y)=f(x+y) ,(2),f (x)/f(y)=f(x-y) f(x+y)+f(x-y)=2f(x)cosy,求证f(x)为周期函数 已知f(x)=3^x,求证：(1)f(x)·f(y)=f(x+y);(2)f(x)/f(y)=f(x-y). y=f(x), f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y f(x+y)+f(xy-1)=f(x)f(y)+2f(n)表达式 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,x-y)=(x^2-y^2)/2xy,求f(x,y)!