{an}为等比数列,公比r>1.a1+a2+a3=21及a1a2a3=216.(a)求通项an.用(a)结果求a1^a1a2^a2...an^an,n=1,2...

问题描述:

{an}为等比数列,公比r>1.a1+a2+a3=21及a1a2a3=216.(a)求通项an.用(a)结果求a1^a1a2^a2...an^an,n=1,2...