已知数列an满足a1=-1/4,an+1=1-1/an,a2009=
人气：444 ℃ 时间：2020-04-29 21:46:05
解答
a1=-1/4
a2=5
a3=4/5
a4=-1/4
可知周期为3
a2009=a2=5
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