问题 解答题

某商场计划拨款9万元购进50台电视机.已知厂家生产三种不同型号的电视机,出厂价分别为:甲种电视机每台1500元,乙种电视机每台2100元,丙种电视机每台2500元.

(1)若商场同时购进其中两种不同型号的电视机共50台,用去9万元,问有多少种不同的进货方案?并写出这些方案.

(2)若商场销售一台甲种电视机可获利150元,销售一台乙种电视机可获利200元,销售一台丙种电视机可获利250元.在第(1)小题的几个方案中,为使销售时获得利润最多,你选择哪种方案?并说明理由.

答案

(1)设购买电视机甲种x台,乙种y台,丙种z台,由题意得:

x+y=50
1500x+2100y=90000

解得:

x=25
y=25

y+z=50
2100y+2500z=90000

解得:

y=87.5
z=-37.5
(舍去)

x+z=50
1500x+2500z=90000

解得:

x=35
z=15

故两种方案:方案1:甲,乙两种电视机各25台.

方案2:购买甲种电视机35台,乙种电视机15台;

(2)选择方案2,理由:

∵商场销售一台甲种电视机可获利150元,销售一台乙种电视机可获利200元,销售一台丙种电视机可获利250元,

∴方案1:25×150+25×200=8750(元),

方案2:35×150+15×250=9000(元),

故选择方案2.

阅读理解

阅读理解。

      It is different to celebrate Christmas around the world.

      In Brazil, Father Christmas is called Papai Noel. Many Christmas customs are similar to those in the USA

or the UK. For those who have enough money, a special Christmas meal will be chicken, turkey, ham, rice,

salad, pork and dried fruits, often with beer. Poorer people will just have chicken and rice.

     In France, every family has a Christmas tree, sometimes decorated in the old way with red ribbons (绸带)

and real white candles. Trees in the garden are often decorated too, with lights on all night. The Christmas

meal is an important family gathering with good meat and the best wine.

     Germans love to decorate their houses at Christmas. In the windows many houses will have colored

pictures of paper or plastic which look beautiful from the outside at night. Father Christmas brings presents

in the late  afternoon of Christmas Eve, after people have been to a church meeting. The presents are then

found under the Christmas tree. One person in the family will ring a bell and call everyone to come to the

room. On Christmas Day, fish or goose will be cooked.

      In Sweden, the most important day is Christmas Eve. A special Christmas meal is eaten on Christmas

Eve-pork, herring (鲱鱼), and brown beans-and this is the time when families give presents to each other.

Many people attend a church meeting early on Christmas Day.

1. Which of the following food is a must in Brazil to celebrate Christmas?

A. Turkey and pork.

B. Turkey and salad.

C. Chicken and rice.

D. Fish and chicken.

2. According to the passage, which of the following is NOT true about Christmas in France?

A. People decorate Christmas trees with red candles.

B. People decorate the tree in their gardens.

C. Gathering to have a family meal is very important.

D. Christmas meal is often served with wine.

3. According to the passage, in Germany at Christmas, people _______.

A. like to brush their walls

B. go to a church meeting on Christmas Day

C. usually eat fish or goose

D. get their presents on Christmas Day

4. The common (共同的) Christmas food that the Swedish and the Brazilian eat is _______.

A. pork

B. turkey

C. fish

D. chicken

5. Which is the best title of the passage?

A. The history of Christmas.

B. Christmas around the world.

C. Christmas in Brazil.

D. Christmas food around the world.

填空题