函数f(x)的定义域为R+,且f(xy)=f(x)+f(y),且f(8)=3,则f(32)=

问题描述:

函数f(x)的定义域为R+,且f(xy)=f(x)+f(y),且f(8)=3,则f(32)=

答:f(x)的定义域为R+,f(xy)=f(x)+f(y)f(8)=3f(8)=f(2×4)=f(2)+f(4)=f(2)+f(2×2)=f(2)+f(2)+f(2)=3所以:f(2)=1f(32)=f(4×8)=f(4)+f(8)=f(4)+3=f(2)+f(2)+3=1+1+3=5所以:f(32)=5