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[不等式] 一道求三元最值的小题

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facebooker posted 2022-8-16 04:31 |Read mode

已知正实数$x,y,z$满足$\sqrt{x^2+y^2}+z=1$,则$xy+2xz$的最大值为__

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色k posted 2022-8-16 08:43

经典老题呀，见《撸题集》P.490 题目 4.6.67

这名字我喜欢

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original poster facebooker posted 2022-8-16 13:56

色k 发表于 2022-8-16 08:43
经典老题呀，见《撸题集》P.490 题目 4.6.67

多谢更佩服K神的记忆力强大

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