正项等比数列{an}中,a2=6,a4=54. (1)求通项公式an; (2)计
题型:解答题
问题:
正项等比数列{an}中,a2=6,a4=54.
(1)求通项公式an;
(2)计算lga1+lga2+lga3+lga4+lga5的值.(要求精确到0.01)参考数据:lg2≈0.3010,lg3≈0.4771.
正项等比数列{an}中,a2=6,a4=54.
(1)求通项公式an;
(2)计算lga1+lga2+lga3+lga4+lga5的值.(要求精确到0.01)参考数据:lg2≈0.3010,lg3≈0.4771.