0,-6,6,-18,30,-66...规律

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0,-6,6,-18,30,-66...规律0,-6,6,-18,30,-66...规律0,-6,6,-18,30,-66...规律-6=-2*(0)-66=-2*(-6)-6-18=-2*(6)-6

0,-6,6,-18,30,-66...规律
0,-6,6,-18,30,-66...规律

0,-6,6,-18,30,-66...规律
-6=-2*(0)-6
6=-2*(-6)-6
-18=-2*(6)-6
30=-2*(-18)-6
-66=-2*(30)-6
从第二项开始 每一项都是前一项的-2倍-6