答案是f(x)=lna 吧.f(xy)=f(x)+f(y),是对数的性质.再根据f‘(1)=a(a≠0) 就可以算出了.
y=f(x);x∈(0,+∞).f(xy)=f(x)+f(y).f(1/2)=1.0
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