找规律填数15,16,13,13,11,22,(),(),7,()...

问题描述:

找规律填数15,16,13,13,11,22,(),(),7,()...

15,16,13,13,11,22,(9),(19),7,( 28)
15-2=13 13-2=11 11-2=9 9-2=7
16-3=13 13+9=22 22-3=19 19+9=28