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[不等式] 变量代换

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nttz posted 2024-5-13 20:54 |Read mode

能说说这个方法为啥正确么? 如果x1等于0，x2不等于0呢，按理也符合条件啊？但是这样的k存在么？如何写才严谨

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kuing posted 2024-5-14 18:22

那就先讨论了 x1=0 的情况，然后再接上面的步骤呗。
x1=0 时显然不是取最大值时，所以补一句话就行了。

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