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將x=0帶入,發現分子分母都是0這種結構的用洛必塔法則:即分子,分母分別求導數,再求極限. ln(1+x)的導數為1/(1+x),帶入x=0,等於1.x的倒數是1 1/1= 1.所以lim ln(1+x)/x = 1
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