问题 解答题

甲、乙两家超市以相同的价格出售同样的商品,为了吸引顾客,各自推出不同的优惠方案,在甲超市购买商品超出300元之后,超出部分按八折优惠;在乙超市购买商品超出200元之后,超出部分按八五折优惠,设购物x元(x>300)。

(1)请用含x的整式表示顾客在两家超市购物分别所用的费用;

(2)当购物为多少元时,两家超市收费一样?(列出等式,不必解答)

答案

解:(1)甲超市购物费用为0.8x+60,乙超市购物费用为0.85x+30;

(2)根据题意,得0.8x+60=0.85x+30。

名词解释
阅读理解

阅读理解。

     When I was young and going to school, a joke was played on me. My friend said, "What is black and

white and red all over?" Of course I said, "I do not know." My friend said, "The newspaper." And he started

to laugh. Those were the days before I read the newspaper. That was before I knew what was ahead and

how important the newspaper would become in my life.

     The first American newspaper was published in Boston in 1690. The paper had only one issue (期刊).

The next newspaper was the Boston Newsletter, printed in 1704. During the following years several other

papers were printed in different parts of America. Today there are thousands of newspapers throughout the

world that report world, national and local news in many different languages. There are morning and evening

papers, all of which have material for every reader. You automatically (自动的) think of the newspaper if you

want to know what is happening in the community (社会).

     But what is a newspaper? A newspaper is a piece of printed paper that presents the current news in the

local community as well as news of national and world events. The world events and important local events

are usually reported on the front page. As you go through the paper, you find sports news, comics, news on

deaths, and news of sqcial events. Often the important speech of a public officer is printed in the paper. You

can even find out who got married in the community.

1. What is black and white and red all over according to the author's friend? [ ]

A. The newspaper.

B. A picture-book.

C. A storybook.

D. An examination paper.

2. When was the first American newspaper published? [ ]

A. In 1704.

B. In 1690.

C. In 1540.

D. In 1890.

3. Which of the following can you find in the newspaper? [ ]

A. Sports news.

B. Important local events.

C. Important speeches.

D. Above all.

4. Which of the following most probably is the hest title for the passage? [ ]

A. Newspapers.

B. Newspaper Types.

C. Newspaper Jokes.

D. Newspaper News.

5. Which of the following is TRUE according to the passage? [ ]

A. Newspapers contain all kinds of colourless contents on the front page.

B. The front page contains the world events and important local events.

C. Sports news,comics,news on deaths are reported on the front page.

D. Th'e front page contains the current news in the local community.