教考资源网 助您教考无忧
5(n?1) (n?2)
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www.jkzyw.com 中国教考资源网
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教考资源网 助您教考无忧
5(n?1) (n?2)
(3) ?Pn?n?2,2n?2?,P1Pn?1(?1,0) ?P?1P1P22?1P1P32???1P1Pn21?111???1?2?2??? 2?5?23?n?1??
?1?1?1111?1?1?2????1??????1?1??2?? ??????n?2??n?1??5?5?1?22?3(n?1)?5?(n?1)?5
www.jkzyw.com
www.jkzyw.com 中国教考资源网
版权所有@中国教育考试资源网