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58问答库 > 高等数学。不定积分。那个sgnx怎么去掉的？

高等数学。不定积分。那个sgnx怎么去掉的？

2025-03-15 04:12:09

推荐回答（3个）

回答（1）：

sgnx的所有偶次方为1 （也就是消了），√x²＝IxI＝xsgnx 所以分母上也会有一个sgnx 消了

回答（2）：

分别考察x取值正数或者负数，即得

回答（3）：

sgn(x)=|x|/x
=√(x²)/x
再把√(x²)乘进去即可。

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