等差数列1,5,9,13,17.找规律
问题描述:
等差数列1,5,9,13,17.找规律
答
公差是4
1,5,9,13,17,21,25..
an=4n-3
等差数列1,5,9,13,17.找规律
公差是4
1,5,9,13,17,21,25..
an=4n-3