问题 解答题
某汽车经销公司计划经销A、B两种品牌的轿车50辆,该公司经销这50辆轿车的成本不少于1240万元,但不超过1244万元,两种轿车的成本和售价如下表.
AB
成本(万元/辆)2426
售价(万元/辆)2730
(1)该公司经销这两种品牌轿车有哪几种方案,哪种方案获利最大,最大利润是多少?
(2)根据市场调查,一段时期内,B牌轿车售价不会改变,每辆A牌轿车的售价将会提高a万元(0<a<1.2),且所有两种轿车全部售出,哪种经销方案获利最大?(注:利润=售价-成本)
答案

(1)设经销A品牌轿车x辆,则经销B品牌轿车(50-x)辆,根据题意得

24x+26(50-x)≥1240
24x+26(50-x)≤1244

解这个不等式组得28≤x≤30

∴该公司经销这两种品牌轿车的方案有三种,即

方案一:经销A种品牌轿车28辆,B种品牌轿车22辆,

方案二:经销A种品牌轿车29辆,B种品牌轿车21辆,

方案三:经销A种品牌轿车30辆,B种品牌轿车20辆.

方案一获利(27-24)×28+(30-26)×22=172万元,

方案二获利(27-24)×29+(30-26)×21=171万元,

方案三获利(27-24)×30+(30-26)×20=170万元.

∴方案一获利最大,最大利润是172万元;

(2)方案一获利(a+3)×28+4×22=172+28a万元,

方案二获利(a+3)×29+4×21=171+29a万元,

方案三获利(a+3)×30+4×20=170+30a万元.

当0<a<1时,方案一获利最大,

当a=1时,三种方案获利一样大,

当1<a<1.2时,方案三获利最大.

阅读理解

"Depend on(依靠) yourself" is what nature says to every man. Parents can help you. Teachers can help you. But all these only help you to help yourself.

  There have been many men in history.  But many of them were very poor in childhood, and no uncles, aunts or friends to help them. Schools were few. They could not depend upon themselves for an education. They saw how it was and set to work with all their strength to know something. They worked their own way till they became well known.

  One of the most famous teachers in England used to tell his pupils, "I can not make worthy men of you, but I can help make men of yourself."

  Some young men don't try their best to make themselves valuable to the human beings. They can never gain achievement(成就) unless they see their weak points and change their course. They are nothing now, and will be nothing as long as they live, unless they accept the advice of their parents and teachers, and depend on their own efforts.

小题1: Which of the following titles fits this article best?

A.What Nature Says to Every Man.

B.How to Be Famous.

C.Men Must Help Each Other.

D.Depend on Yourself.小题2:According to the famous teacher in England, a teacher can________.

A.make his pupils worthy men 

B.help his pupils find a way to be famous

C.help his pupils make themselves useful men

D.make his pupils men of strength and courage小题3:From this article we can learn the writer ________.

A.sings highly praise for parents and teachers

B.is a man of strong character

C.thinks highly of those who are struggling or success

D.feels it the most important of all to accept the advice of others

单项选择题