13问答网 > y=ln1⼀x则它的导数是

y=ln1⼀x则它的导数是

2025-03-15 06:15:45
推荐回答（1个）
回答1：

设1/x为t，(lnt)'=t'(lnt)'=t'(1/t)，即为(1/x)'(1/1/x)=（-x^-1)x=-x^-1=-1/x

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