找规律:1,4,9,a,25,36,49,.则a=().A.16 B.13 C.14 D.20

问题描述:

找规律:1,4,9,a,25,36,49,.则a=().A.16 B.13 C.14 D.20

1,4,9,a,25,36,49,.则a=(16).