试题与答案

(本小题满分13分) 在(1+x+x2)(1-x)10的展开式中,含x4项的系数

题型:解答题

题目:

(本小题满分13分)

在(1+xx2)(1-x)10的展开式中,含x4项的系数是 多少?                  

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/62fd7996fd6be8b74856e7b44e60bbb1.html

下面是错误答案,用来干扰机器的。

 AC曲线运动中合力指向曲线的凹侧,所以粒子受到斥力作用,由点电荷周围的电场线和等势线的分布可知ac两点电势能相同,所以粒子的动能先减小后增大,A对;距离点电荷越近场强越大,电场力越大,C对;D错;

试题推荐
题型:阅读理解

How could we live without the Internet? That's how most of us keep in touch with friends, find homework support, research cool place to visit, or find out the latest news. You can use it to do research for school, find out what movie is on near you, check out a college you're thinking about, or find a job or volunteer opportunity. Almost anything you can think of has a website about it.

You've probably heard stories about people who get into trouble in chat rooms. Because users can easily keep anonymous, you may be cheated in the chat room. Everyone in the chat room looks like wearing a mask(面具). Chat rooms often attract people who are interested in more than just chatting. They will sometimes ask visitors for information about themselves. The information might be about their families, or where they live. It shouldn't be given away.

Usually, the people who request personal information like home addresses, phone numbers, and email addresses use the information to do some illegal(违法的) things. This might harm a person's or family's well-being.

Of course, the Internet is home to millions of places you can and should visit. However, remember to protect yourself while online.

小题1:The first paragraph is mainly about _________of the Internet.

A.the advantage

B.the safety

C.The interest

D.the trouble小题2:Which can't the Internet do for you according to the passage?

A.Find out the latest news.

B.Research a cool place to visit.

C.Do homework

D.Get information of your school小题3:The underlined words "keep anonymous" mean "______" in the passage.

A.keep its name different

B.keep its name unknown

C.keep its story interesting

D.keep its name known小题4:The Internet is an unsafe place because_____.

A.There are many illegal things

B.Your personal information may be given away.

C.The computers may be harmed

D.Your e-mail address might be changed小题5:What can we learn from the passage?

A.Internet users should wear a mask.

B.The Internet makes it difficult to use the computer.

C.We'd better not give away the personal information on the Internet.

D.It's difficult to get cheated on the Internet.

查看答案
题型:问答题

【说明】


某公司要开发一个销售管理系统,该系统的主要功能是:处理客户和销售员送来的订单;工厂是根据订货安排生产的,交出货物同时开出发票,收到客户付款后,根据发票存根进行应收款处理。每张订单由订单号,若干头信息和订单细节组成。一张订单可定购多种产品,工厂对大宗订货给予优惠。每种产品都规定了不同订货数量的折扣。
根据—上述要求公司的销售部王经理写下了以卜数据表结构:
客户:(客户号,客户名,地址,电话)
订单:(订单号,客户号,产品号,订货数,订货日期,交货日期,金额)
应收账款:(客户号,订单号,发票号,应收金额,支付日期,支付金额,当前余额)
产品描述:(产品号,产品名,单价,重量)
折扣规则:(产品号,订货量,折扣)
1. 【问题1】
上表中带下划线的为主码。请为还没有确定主码或是主码不合理的数据表选定最合适的主码。

查看答案
题型:单项选择题

甲和乙是盗窃案的共犯,被人民法院判处有期徒刑后在同一监狱服刑。二人在服刑期间脱逃至A市。甲在A市某宾馆吃饭时被抓获,押解回监狱后发现甲在A市还犯有盗窃罪;乙在A市抢劫时被当场抓获。对甲和乙所犯的新罪应当如何进行管辖

A.二人均由监狱一并进行侦查

B.二人均由A市公安局一并进行侦查

C.甲由监狱进行侦查,乙由A市公安局进行侦查

D.乙由监狱进行侦查,甲由A市公安局进行侦查

查看答案
微信公众账号搜索答案