在等差数列{an}中，已知a5+a8=5，那么a2+a11的值为（　　）-湖北继续教育网网校

首页

普通专升本

成人高考

学位英语

在线刷题

最近学习

最近学习课程

最强大脑 · 3天挑战极限记...

副标题副标题副标题副
最强大脑 · 3天挑战极限记...

副标题副标题副标题副

您现在位置：模拟考场> 湖北成人高考> 高起点> 文科数学> 浏览试题

[单选题]在等差数列{an}中，已知a5+a8=5，那么a2+a11的值为（　　）

A5

B10

C15

D20

收藏查看答案

相关题目

热门试题

1. Space-based solar power will rule out other forms of renewable energy sources. （　　）查看材料
2. 34．歌德
3. 下列土壤分类中，属于隐地带性土壤的是（）
4. 肛测法的正常体温是（）
5. 2.Today anymore will accept money in exchange for goods and services. People use money to buy food, furniture, books bicycles and hundreds of others they need or want. When they work, they usually get paid in money.Most of the money today is made of metal or paper. But people used to use all kinds if things as money. One of the first kinds of money was shells. Shells were not the only things used as money. In China, cloth and knives were used. In the Philippine Islands, rice was used as money. In parts of Africa, Cattle were one of the earliest of money .Other animals were used as money too.The first metal coins were made in China. They were around and had a square hole in the center. People strung them together and carried them from place to place. Different countries have used different metals and designs for their money. The first coins in England were made of tin. Sweden and Russia used copper to make their money. Later, other countries began to make coins of gold and silver.But even gold and silver were inconvenient if you had to buy something expensive. Again the Chinese thought of a way to improve money. They began to use paper money. The first paper money looked more like a note from one person to another than paper money used today. Money has had an interesting history from the days of shell money until today.(10分)2.1 Which of the following can be cited as an example of the use of money in exchange for services?(2分)A. To sell a bicycle for $20.B. To get some money for old books at a garage sale.C. To buy things you need or want.D. To get paid for your work.

热门试卷