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