y = (x-1)*3次根号下x² = (x-1) * x^(2/3) = x^(5/3) - x^(2/3)
y′ = (5/3)x^(2/3) - (2/3)x^(-1/3) = (1/3)x^(-1/3) * (5x-2)
y′′ = (10/9)x^(-1/3) + (2/9)x^(-4/3) = (2/9)x^(-4/3) * (5x+1)
凸区间：（-∞，-1/5）
凹区间：（-1/5，+∞）
x=-1/5时，y= (-1/5-1) * 3次根号下(1/25) = (-6/25)*3次根号下5
拐点：（-1/5，(-6/25)*3次根号下5 ）
求二阶导数:
y=(x-1)x^(2/3)
y'=x^(2/3)+(x-1)*2/3x^(-1/3)
y"=
内容全部来源于网络收集，如有侵权，请联系网站删除！
QQ：24596024