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[函数] 导数，存在两条平行切线，求参数范围

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guanmo1 Posted 2019-7-11 23:00 |Read mode

微信图片_20190711230817.jpg

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facebooker Posted 2019-7-12 18:54

叫兽的题目

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Author| guanmo1 Posted 2019-7-13 07:11

回复 2# facebooker 咋做呢？

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realnumber Posted 2019-7-13 15:04

回复 3# guanmo1

估计这样，说明导函数不单调，求出导函数单调情景（再求下导），取个补集.

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