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

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

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