RT
(高一数学,求过程)
RT
(高一数学,求过程)
令x=y=0,则f(0)=f(0)×f(0)
∵ f(0)≠0
∴f(0)=1
再令 x=0,y=2005 ,则f(0)=f(0)×f(2005)
∴1=1×f(2005) ,即 f(2005)=1
令y=0,得对任意实数x,f(x*0)=f(x)*f(0),即对任意实数x,f(0)= f(x)*f(0),因为f(0)不等于0,所以把f(0)约掉,就得对任意实数x,f(x)=1,自然得f(2005)=1
令x=0,y=0,
f(0)=f(0)xf(0)
∵f(0)≠0
∴f(0)=1
令x=0,y=2005,
∵f(0x2005)=f(0)=f(0)xf(2005)
∴f(2005)=1