f(xy)=f(x)+f(y)且f(8)=3则f(2)=

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f(xy)=f(x)+f(y)且f(8)=3则f(2)=f(xy)=f(x)+f(y)且f(8)=3则f(2)=f(xy)=f(x)+f(y)且f(8)=3则f(2)=f(4)=f(2)+f(2)=2

f(xy)=f(x)+f(y)且f(8)=3则f(2)=
f(xy)=f(x)+f(y)且f(8)=3则f(2)=

f(xy)=f(x)+f(y)且f(8)=3则f(2)=
f(4)=f(2)+f(2)=2f(2)
f(8)=f(4)+f(2)
3=2f(2)+f(2)
3=3f(2)
f(2)=1