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极限等价替换公式

更新时间: 2021-02-22 15:48:24     

1、sinx~x

tanx~x

arcsinx~x

arctanx~x

e^x-1~x

ln(1+x)~x

(1+x)^α-1~αx

1-cosx~x^2/2

2、求极限时,使用等价无穷小的条件:

被代换的量,在取极限的时候极限值为0;

被代换的量,作为被乘或者被除的元素时可以用等价无穷小代换,但是作为加减的元素时就不可以,加减时可以整体代换,不一定能随意单独代换或分别代换

关键词: 极限 等价 替换 公式

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