[閒聊] 一題數學（排列組合）
誰能救我
跪求數學神
我算到第5題就算到發慌了
玩玩手機小偷懶一下吧 哈哈
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11/19 19:31, , 1F
11/19 19:31, 1F
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11/19 19:33, , 2F
11/19 19:33, 2F
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11/19 19:37, , 3F
11/19 19:37, 3F
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11/19 19:38, , 4F
11/19 19:38, 4F
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11/19 19:38, , 5F
11/19 19:38, 5F
推
11/19 19:39, , 6F
11/19 19:39, 6F
推
11/19 19:47, , 7F
11/19 19:47, 7F
推
11/19 19:48, , 8F
11/19 19:48, 8F
推
11/19 20:01, , 9F
11/19 20:01, 9F
推
11/19 20:20, , 10F
11/19 20:20, 10F
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11/19 23:13, , 11F
11/19 23:13, 11F