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回复 青青子衿 挺简单的吧.......... 首先$BC-AC\le AC$,可知$M=AC=\frac{5}{2}$ \ 随便什么方法都好 ... 战巡 发表于 2014-1-19 15:41
回复 青青子衿 有啥好改的...... 还不是导数天下无敌......... 战巡 发表于 2014-1-19 16:44
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2025-7-21 11:47 GMT+8
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