设f(x+y)=f(x)·f(y),且f(2)=3,求f(6)=______.

设f(x+y)=f(x)·f(y),且f(2)=3,求f(6)=______. f(x+y)=f(x)·f(y),且f(1)=2,求f(2)/f(1)+f(3)/f(2)+...+f(2010)/f(2009) 离散数学集合论,证明:f是映射,设f:X->Y,f是单射当且仅当任意F属于2^X,f-1(f(F))=F 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)对任意实数x,y,有f(x+y)=f(x)+f(y),且当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) 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)是奇函数,对任意x,y属于R,都有f(x+y)=f(x)+f(y),且x>0时,f(x) 设函数f(x)是奇函数,对任意x,y属于R,都有f(x+y)=f(x)+f(y),且x>0时,f(x) 设函数f(x)对任意x,y∈R,都有f(x+y)=f(x)+f(y),且x>0,f(x) 设f(x)在x=0处可导,且对任意x.y满足f(x+y)=f(x)f(y),证明f(x)处处可导,且f'(x)=f'(0)f(x) 设f(x)是一次函数,且f[f(x,y)]=4x+3,求f(x). 设函数y=f(x)满足f(x+2)=-f(x),且f(2)=2,求f(-2)、f(4)、f(100)的值 设函数y=f(x)满足f(x+2)=-f(x),且f(2)=2,求f(-2),f(4),f(100)的值 设函数y=f(x)满足f(x+2)=-f(x),且f(2)=2求f(-2),f(4),f(100)的值 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)