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記第n個數為A(n)可以看出這樣的關係:A(n+1)=-2A(n)+6 根據遞推關係A(n+1)-2=-2(A(n)-2) 得到A(n)=(-2)^n+2 所以第十個數是A10=(-2)^10+2=1026 這個序列也應該是:0,6,-6,18,-30,66,-126258,-5101026,-2046…… 有疑問歡迎HI我
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