按规律填数:1,3,7,15,31,( ),127. A.88 B.1 C.63 D.112
问题描述:
按规律填数:1,3,7,15,31,( ),127.
A. 88
B. 1
C. 63
D. 112
答
31×2+1,
=62+1,
=63;
要填的数是63.
故选:C.