等差数列{an}中,a3+a5+a7+a9+a11=20,则a8-12a9=( 发布时间:2017-04-29 23:18 │ 来源:www.tikuol.com 题型:选择题 问题: 等差数列{an}中,a3+a5+a7+a9+a11=20,则a8-12a9=( )A.1B.2C.3D.4
题型:选择题 —May I listen to the music here, Mr. White?—Sorry, you’d better it like that.A.not to doB.not doC.don’t doD.not do to 查看答案