小明投资销售一种进价为每件20元的护眼台灯．销售过程中发现，每月销售量y（件）与

发布时间：2017-05-13 13:28 │ 来源：www.tikuol.com

题型：解答题

问题：

小明投资销售一种进价为每件20元的护眼台灯．销售过程中发现，每月销售量y（件）与销售单价x（元）之间的关系可近似的看作一次函数：y=-10x+500，在销售过程中销售单价不低于成本价，而每件的利润不高于成本价的60%．

（1）设小明每月获得利润为w（元），求每月获得利润w（元）与销售单价x（元）之间的函数关系式，并确定自变量x的取值范围．

（2）当销售单价定为多少元时，每月可获得最大利润？每月的最大利润是多少？

（3）如果小明想要每月获得的利润不低于2000元，那么小明每月的成本最少需要多少元？（成本=进价×销售量）

考点：求二次函数的解析式及二次函数的应用

题型：解答题

阅读理解。

     Students learn their lessons in class. In class teachers teach them. Students sit in the classroom listening
to the teacher. This is a way of learning. Is this the only way for students to learn something? Of course not.
There is another way to learn. That is students can teach themselves. For example, if you can not remember
something when you are doing your homework, you can look at the book to find the answer. This is a way to
teach yourself. And it is not a difficult thing. We can do this at any place and at any time.
     How do you teach yourself? The first thing you must do is reading. Read something you are interested in,
or you have to read. The second is that you must ask yourself questions. The question is something you do
not understand, or you want to know about.You can write down these questions. A clever student is usually
good at asking questions. The third is to ask the question yourself by thinking hard, by reading the text or other
books, and sometimes by asking other people. This is the way of teaching yourself. And you must do this all
by yourself.
     If you keep doing like this for a long time, you are sure to succeed in your study.

任务型阅读: 根据短文内容,填写下列表格。

Students learn their lessons in class.

How do you teach yourself?
1.The first thing you must do is 1. _____.
2.The second is that you must ask yourself 2._____.You can 3._____ them
down.
3.The third is to ask the question yourself by 4._____ , reading and asking.
You must do this all by 5._____ .

If you keep like this for a 6 ._____ time, you will succeed in your study.

查看答案

题型：解答题

糖尿病酮症酸中毒的诱发因素是（）

A.感染

B.饮食不当

C.妊娠

D.创伤

E.胰岛素治疗突然中断

查看答案

题型：解答题

证见壮热，口渴饮冷，面红目赤，烦躁不宁，小便短赤，大便干结，舌红苔黄，脉洪数，属（）。

A.表邪入里

B.里热炽盛

C.热入营血

D.心火亢盛

E.阴虚火旺

查看答案

题型：解答题

扒渣机臂的上、下速度为（）。

A、100mm/sec

B、200mm/sec

C、500mm/sec

查看答案

题型：解答题

城镇初始地籍调查的范围包括（）。

A.国营农、林、牧、渔场和独立工矿的用地

B.集镇、建制镇和独立工矿的用地

C.城市、集镇、村庄

D.城市、建制镇和独立工矿的用地

查看答案

更多题库