Question

1,9,17,25,33.n 求第n个规律 2,10,18,26,34.n规律 3,11,19,27,35.n规律

Answer 1

这三个数列都是等差数列,以1,9,17,25,33.n 为例,9-1=8,17-9=8,25-17=8,33-25=8,所以n的通项为8n-7;同理,数列2,10,18,26,34.n是以2为首项,8为等差的等差数列,n=8n-6;数列3,11,19,27,35.n是以3为首项,8为等差的等差数列,n=8n-5.

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