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[不等式] 据说构造几何图形可做 咋整?

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facebooker posted 2019-8-12 16:17 |Read mode
求$13+x+2y-xy$的最大值,其中$x²+y²=10$

只想到了拉乘 但是算不下去啊

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kuing posted 2019-8-12 17:30
检查有没有抄错,否则扔掉。

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