若[tex=2.286x1.357]HtxWfi2xd9u5GZnM+WySEg==[/tex]是下凸函数，问[tex=8.071x1.786]o/MzHM+CxwaqxDg+G8BmjP3veS/G4Jna0DG2+K75K2Am/Q85awyfYRZe/nogfWBS[/tex]是不是下凸函数?
若[tex=2.286x1.357]HtxWfi2xd9u5GZnM+WySEg==[/tex]是下凸函数，问[tex=8.071x1.786]o/MzHM+CxwaqxDg+G8BmjP3veS/G4Jna0DG2+K75K2Am/Q85awyfYRZe/nogfWBS[/tex]是不是下凸函数?
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