f(0-0)=f(0)+f(0)→ f(0)=2f(0)→ f(0)=0 .f(n-n)=f(n)+f(n)→ 2f(n)=f(0)=0 f(n)=0 所以你所求的都得零
函数F(x)满足F(x-y)=F(x)+F(y)求F(1) F(1/3)+F(1/2)+F(1)+F(2)+F(3)
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