1,-1,3,-2,9,-4,( ) ( )按规律填空.

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1,-1,3,-2,9,-4,( ) ( )按规律填空.
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1,-1,3,-2,9,-4,( ) ( )按规律填空.
1,-1,3,-2,9,-4,( ) ( )按规律填空.

1,-1,3,-2,9,-4,( ) ( )按规律填空.
27-8

12,-8

27 -8

二十一、负八

27 -8

27 -8

27-8

3的0次方,-(2的0次方),3的1次方,-(2的1次方),3的2次方,-(2的2次方),3的3次方=27,-(2的3次方)=-8

1,3,9是3倍递进,-1,-2,-4是2倍递进,答案就是28,-8