|x-1 | /x的导数怎么求还有极值和拐点

问题描述:

|x-1 | /x的导数怎么求还有极值和拐点

x=1,f(x) = |x-1 | / x = 0
x>1,f(x) = |x-1 | / x = 1 - 1/x
f '(x) = 1/x²,f ''(x) = -2/x³
f(x) 单增,是凸函数;
x