问题描述：
suppose that f is a continuously differentiable function and f(x/3)=f(x)/3 for all x in R
a) show that f(0)=0
b) show that f ' is constant and in fact for all x,f ' (x)=f(1)
a) show that f(0)=0
b) show that f ' is constant and in fact for all x,f ' (x)=f(1)
问题解答：
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