已知等差数列{an}的前m项和为30,前2m项和为100,则它的前3m项和为[ 发布时间:2017-05-03 02:35 │ 来源:www.tikuol.com 题型:选择题 问题: 已知等差数列{an}的前m项和为30,前2m项和为100,则它的前3m项和为[ ]A.130 B.170 C.210D.260
题型:选择题 _____thirsty I am, I never seem to be able to finish the large bottle of Cola placed before me.[ ]A. WhateverB. Whenever C. WhereverD. However 查看答案