试题与答案

一快餐店试销某种套餐,试销一段时间后发现,每份套餐的成本为5元,该店每天固定支出

题型:解答题

题目:

一快餐店试销某种套餐,试销一段时间后发现,每份套餐的成本为5元,该店每天固定支出费用为600元(不含套餐成本)。若每份售价不超过10元,每天可销售400份;若每份售价超过10元,每提高1元,每天的销售量就减少40份。为了便于结算,每份套餐的售价x(元)取整数,用y(元)表示该店日净收入。(日净收入=每天的销售额-套餐成本-每天固定支出)

(1)求y与x的函数关系式;

(2)若每份套餐售价不超过10元,要使该店日净收入不少于800元,那么每份售价最少不低于多少元?

(3)该店既要吸引顾客,使每天销售量较大,又要有较高的日净收入。按此要求,每份套餐的售价应定为多少元?此时日净收入为多少?

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:在蝗虫胸腹部的左右两侧有一些小孔是气门,为气体进出蝗虫体内的门户,而在蝗虫体内真正进行气体交换的场所是气管,所以蝗虫的呼吸器官是气管。点评:此题为基础题,解答此题的关键是熟记蝗虫的...

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     In the Datian Nature Reserve of Hainan the deer population has increased from 26 in 1976 to the present

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     The Datian Reserve is only 13 square kilometers in area, which is too small for the Hainan deer to find good

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      Because more and more people have moved to the island and settled here, more land is used for building.

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     The Hainan deer is brown, with the female lighter in colour, and has a clear black line across the back. They

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     In September, the female deer start to bear fawns. The little deer follow their mothers until two years of age.

 

1. From the passage we know the Hainan deer _____.

A. has no antlers

B. has no plum flower spots on the body

C. is out of the woods of endangerment

D. hasn't increased since 1976

2. What makes the Hainan deer endangered?

A. More land is being developed.

B. The Datian Reserve is too small.

C. Illegal hunting.

D. All of the above.

3. During the period, from mid-January to June, the male deer fight against each other in order to _____.

A. get more choices to breed

B. get enough food

C. get good places

D. get more baby deer

4. The writer wrote this article mainly to ______ .

A. tell us that the number of Hainan deer is increasing

B. introduce us a most precious deer

C. let us know where Hainan deer live

D. warn us that the Hainan deer is endangered

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