等差数列{an}中,a1=﹣5,它的前11项的平均值是5,若从中抽取1项后余下的 发布时间:2017-04-29 17:18 │ 来源:www.tikuol.com 题型:填空题 问题: 等差数列{an}中,a1=﹣5,它的前11项的平均值是5,若从中抽取1项后余下的10项的平均值仍为5,则抽取的是第( )
题型:填空题 -I’m sorry for _______ in time.—That’s all right.A.getting it not doneB.not getting it doneC.getting not it doneD.getting not to do it 查看答案