— Are these your pants? — No, they're __ 发布时间:2017-04-11 15:20 │ 来源:www.tikuol.com 题型:选择题 问题: — Are these your pants?— No, they're _____________. [ ]A. JohnB. johnC. John'sD. john's
题型:选择题 设数列{an}满足:a1=5,an+1+4an=5,(n∈N*)(I)是否存在实数t,使{an+t}是等比数列?(Ⅱ)设数列bn=|an|,求{bn}的前2013项和S2013. 查看答案