已知数列{an}是非零等差数列,又a1,a3,a9组成一个等比数列的前三项,则a 发布时间:2017-04-29 13:07 │ 来源:www.tikuol.com 题型:填空题 问题: 已知数列{an}是非零等差数列,又a1,a3,a9组成一个等比数列的前三项,则a1+ a3+a9a2+a4+a10的值是______.
题型:填空题 While demanding lip service to an impractical ideal, the amateur system has left American athletes to fend themselves in a degrading world of under-the-table payoffs and over-the-table handouts. 查看答案