设函数f(x)对任意x,y满足f(x+y)=f(x)+f(y),且f(2)=4,则f(-1)的值为______.
设f(x)是R上的函数,且满足f(0)=1,并且对任意实数x,y,有f(x-y)=f(x)-y(2x-y+1),求f(x
1.对任意的正数函数f(x)满足f(xy)=f(x)+f(y),且f(8)=3,则f(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
已知不恒为0的函数f(x)对任意实数x,y满足f(x+y)+f(x-y)=2【f(x)+f(y)],则f(x)的奇偶性是
设f(x)是R上的函数,且满足f(0)=1,并且对任意实数,都有y(x-y0=f(x)-y(2x+y+1)成立,则f(x
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)*f(y)-f(y)-x+2 求(FX)
已知函数f(x)的定义域为R,对任意实数x,y满足f(x+y) =f(x)f(y)且f(x)>0,f(2)=9
设f(x)是定义在R上的函数,且满足f(0)=1,并且对任意实数x,y,有f(x-y)=f(x)-y(2x-y+1),求
设f(x)是定义在R上的函数,且满足f(0)=1,并且对任意实数x,y,有f(x-y)=f(x)-y(2x-y+1),求
设f(x )是R上的函数,且满足f(0)=1,并且对任意实数x,y,都有f(x-y)=f(x)-y(2x-y+1),
已知函数f(x)满足:对任意x,y∈R,都有f(x+y)=f(x)•f(y)-f(x)-f(y)+2成立,且x>0时,f
设函数f(x)的定义域为R,当x>0时,f(x)>1,且对任意x,y∈R,都有f(x+y)=f(x)*f(y)