" F(x,y)=0
f(x+y)=f(x)f(y)且,x>0,f(x)属于(0,1)
x,y属于R 且f(x)+f(y)=f(x+y)恒成立 当x>0,f(x)
已知:f(x+y)+f(x-y)=2f(x)*f(y),x.y取任何实数且f(0)不等于0,求证:f(x)为偶函数
已知函数f(x)满足f(x+y)+f(x-y)=2f(x)f(y)(x∈R,y∈R),且f(0)≠1.
已知F(X*Y)=F(X)+F(Y)定义域为(0,正无穷大)且是增函数,求证F(X/Y)=F(X)-F(Y)
设f(x)=(a^x+a^y) (a>0),证明f(x+y)+f(x-y)=2f(x)f(y)
f(xy)=f(x)+f(y),证明f(x/y)=f(x)-f(y)
定义在R上的函数f(x)满足f (x + y) = f (x) + f ( y )(x,y∈R),当x>0时,f (x)
设函数f(x)对任意实数x,y都有f(x+y)=f(x)+f(y),且x>0时,f(x)
设函数f(x)对于任意x,y∈R,都有f(x+y)=f(x)+f(y),且x>0时f(x)
已知f(x)对任意x、y(属于R)满足f(x)+f(y)=f(x+y) 且当x>0时,f(x)
设函数f(x)对任意实数x,y,有f(x+y)=f(x)+f(y),且当x>0时,f(x)