一道数列推理的题:22,18,5,12,-6,17,( ),选项有-22,-24,6,12.说一下分析过程,谢谢.

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一道数列推理的题:22,18,5,12,-6,17,( ),选项有-22,-24,6,12.说一下分析过程,谢谢.
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一道数列推理的题:22,18,5,12,-6,17,( ),选项有-22,-24,6,12.说一下分析过程,谢谢.
一道数列推理的题:22,18,5,12,-6,17,( ),选项有-22,-24,6,12.说一下分析过程,谢谢.

一道数列推理的题:22,18,5,12,-6,17,( ),选项有-22,-24,6,12.说一下分析过程,谢谢.
选-22.前两项相减,再±1.
(22-18)+1=5
(18-5)-1=12
5-12+1=-6
12-(-6)-1=17
-6-17+1=-22

应该是 -22
22-18=4,4+1=5
18-5=13,13-1=12
5-12=-7,-7+1=-6
12-(-6)=18,18-1=17
-6-17=-23,-23+1=-22

22-5+1=18
18-12-1=5
5-(-6)+1=12
12-17-1=-6
(-6)-x+1=17可以推算出x=-22

A(N)=A(N-2)-A(N-1)+(-1)^(N-1)
5=22-18+1
12=18-5-1
-6=5-12+1
17=12-(-6)-1
所以,括号里的是=-6-17+1=-22