设数列{an}满足a1=2,a(n+1)=an+1/an(1)求a2,a3,a4(2)比较an与根号(2n+1)的大小,
3个回答
(1) a2=2+1/2 =5/2
a3=5/2+1/2=3
a4=3+1/2 =7/2
又因为
(2)证明:
当 n=1时 a1=2 > √3 成立
当 n=2时 a1=5/2> √5 成...
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