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不對吧,應該是x→0吧? 主要是凑出f'(0)的定義式,所以要除以2x,再處理多餘的部分. lim(x→0)(f(2x)-f(0))/x=lim(x→0)(f(2x)-f(0))/(2x)*2=f'(0)*2=1/2 f'(0)=1/4
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