七上数学期中考试找规律题型公式总结 一.等差数列 1,3,5,7,9,11,...,2n-1(n为正整数) 2,4,6,8,10,12,.,2n(n为正整数) 5,8,11,14,17,20,...,3n+2(n为正整数) 二.等比数列 2,4,8,16,32,64,..,2n(n为正整数) 1,2,4,8,16,32,..,2n-1(n为正整数) 3,5,9,17,33,65,...,2n+1(n为正整数) 三.平方数列及衍生数列 1,4,9,16,25,36,..,n2(n为正整数) 2,5,10,17,26,37,...,n2+1( n为正整数) 0,3,8,15,24,35,...,n2-1(n为正整数) 四.三角数列及行生数列 1,3,6,10,15, 21, ..., n(n+ 1)/2(n为正整数) 2,6,12,20,30,42,...,n(n+1)(n为正整数)
