设c(n)=b(n)/b(n-1)=(1+1/(n-1))^2/2,是个随n增加而递减的数列.
c(2)=2>1,c(3)=1.125>1,c(4)=0.89=5后,c(n)1,则b(n)>b(n-1)；反之b(n)
设数列{bn}满足bn=n^2/2^(n+1),证明:bn
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