版上有许多询问97年的题目，就是没问到这题 是太简单了吗QQ A number a is called a fixed pointed of a function f if f(a)=a. Prove that if f'(x)≠1 for all real numbers x, then f has at most one fixed point. 不常作这种证明题，恳请各位大哥大姊提点一下 --

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