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例题
Section titled “例题”
(定义域为 R , 否则无解)
求导函数
Section titled “求导函数”
求导:
解:
.
是
一
个
驻
点
但
不
是
极
值
点
代入得:
琴生 inequality
Section titled “琴生 inequality”
当
是一个上凸函数时, 有:
下凸函数反之.
则此题最小值为: