设X(0)=0,M(0)=0,M(n)=M(n-1)+n, n=1,2,3,... X(n)=6*M(n)+X(

来源: 湘笑于 2018-02-10 18:34:43 [旧帖] [给我悄悄话] 本文已被阅读：次

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