f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)

来源：学生作业帮助网编辑：六六作业网时间：2024/05/06 00:56:18

f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)f(X)的定义域为{

f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)
f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)

f(X)的定义域为{x│x>0}且f(xy)=f(x)+f(Y)若f(9)=8.求f(3)
f(9)=f(3*3)=f(3)+f(3)=8=>f(3)=4