1.1,5,13,25...n2.3,9,18,30.n
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![1.1,5,13,25...n2.3,9,18,30.n](/uploads/image/z/4606206-6-6.jpg?t=1.1%2C5%2C13%2C25...n2.3%2C9%2C18%2C30.n)
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1.1,5,13,25...n2.3,9,18,30.n
1.1,5,13,25...n
2.3,9,18,30.n
1.1,5,13,25...n2.3,9,18,30.n
1、an=2n^2-2 n
2、an=(3n^2+3n-6)/2 n=2
1. 依次加4,8,12……
2. 依次加6,9,12……
N(N+4)
3N(N+1)/2
第一题是41
第二题是45
an=2n^2-2 n
2、an=(3n^2+3n-6)/2 n=2
第一题是41
第二题是45