已知等比数列{an}(n∈N*)中有a5a11=4a8,数列{bn}是等差数列, 发布时间:2017-04-30 03:37 │ 来源:www.tikuol.com 题型:选择题 问题: 已知等比数列{an}(n∈N*)中有a5a11=4a8,数列{bn}是等差数列,且a8=b8,则b7+b9=( )A.2B.4C.8D.16
题型:选择题 —Who do you guess I am? —Sorry,your name my mind.A.slipped B.has slipped C.had slipped D.slips 查看答案