两个数列{An}{Bn}中,An>0,Bn>0,且An,Bn^2,An+1成等差数列,且Bn^2,An+1,Bn+1^2,成等比数列.
问题(1)证明{Bn}是等差数列?
问题(2)若A2=3A1=3,求lim(B1+B2+…Bn)/An的值?