已知正项数列{an},{bn}满足:对任意正整数n,都有an,bn,a(n+1)成等差数列,bn,a(n+1),b(n+1)成等比数列且a1=10,a2=15,(1)求数列{√bn}是等差数列,(2)求{an}{bn}的通项公式(3)设Sn=1/a1+1/a2+.+1
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