已知数列{an}满足a1=a,a(n+1)=an^2+a,集合M={a属于R|n属于N+,|an|
2个回答
(1)a=2,故a不属于M
(2)a属于(0,1/4)时,an>0
法一:
不妨设|an|0
n=1时a1
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