填一个数:1,5,9,13,(),21,25?
问题描述:
填一个数:1,5,9,13,(),21,25?
=17 =15 =18 =20 =19 =0
答
17 每增加一个+4
填一个数:1,5,9,13,(),21,25?
=17 =15 =18 =20 =19 =0
17 每增加一个+4