2,7,28,63,( ),215.A,125;B,126;C,127;D,128.

问题描述:

2,7,28,63,( ),215.A,125;B,126;C,127;D,128.

b.126
1的立方+1=2
2的立方-1=7
3的立方+1=28
4的立方-1=63
5的立方+1=126