如果数列+1,-1,+1,-1,+1,-1,...可表示为（-1)^n+1 (n=0,1,2,3,4,5.);
如果数列+1,-1,+1,-1,+1,-1,...可表示为（-1)^n+1 (n=0,1,2,3,4,5.);
如果数列+1,-1,+1,-1,+1,-1,...可表示为（-1)^n+1 (n=1,2,3,4,5,6.);
那么数列+1,+1,-1,-1,+1,+1,...如何用n表示
如果数列+1,-1,+1,-1,+1,-1,...可表示为（-1)^n+1 (n=1,2,3,4,5,6.);
那么数列+1,+1,-1,-1,+1,+1,...如何用n表示
数学人气：596 ℃时间：2019-10-11 17:06:41
优质解答
这都属于周期数列.an=sin(pi)n/2-cos(pi)n/2
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