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请教雅礼的排列组合题

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hjfmhh posted 2024-4-10 10:13 |Read mode
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睡神 posted 2024-4-10 11:05
小题不难,要是大题,怎样去表达比较好点?
除了不懂,就是装懂

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original poster hjfmhh posted 2024-4-10 14:22
睡神 发表于 2024-4-10 11:05
小题不难,要是大题,怎样去表达比较好点?
第二问怎么做?

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睡神 posted 2024-4-10 22:44
hjfmhh 发表于 2024-4-10 14:22
第二问怎么做?
除了分类讨论,暂时没有想到什么好办法...而分类讨论也要写一堆文字表述,算了,我的水平有限,还是匿了...
除了不懂,就是装懂

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