求函数y=x^4-2x^3+1的凹凸区间和拐点
人气：435 ℃ 时间：2020-06-03 02:46:37
解答
对此函数求二阶导
y=x^4-2x^3+1
y`=4x^3-6x^2
y``=12x^2-12x
凹区间为二阶导数大于0的区间
即12x^2-12x>0
解得x>12或x
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