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SAT官方每日一题附答案和解析[数学](2017年7月26日)

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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

The government of a particular country is planning to subsidize electric vehicles by lowering their prices in order to encourage consumers to purchase them. Electric vehicles are currently being purchased steadily at a rate of about 287 per month, with an average purchase price of $24627. For each drop of $1000 in the average electric vehicle's purchase price, it is expected that the monthly purchase rate will increase by 48. Which of the following best models the monthly electric vehicle revenue, R(p), in this country as a function of p price reductions of $1000 each?
(revenue=price of product*number of product)

A.R(p)=24627(287-952p)
B.R(p)=1000(24627-p)(287+48p)
C.R(p)=(24627-p)(287+p)
D.R(p)=(24627-1000p)(287+48p)

重点单词   查看全部解释    
vehicle ['vi:ikl]

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n. 车辆,交通工具,手段,工具,传播媒介

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subsidize ['sʌbsidaiz]

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vt. 给与补助金或奖助金,贿赂

 
function ['fʌŋkʃən]

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n. 功能,函数,职务,重大聚会
vi. 运行

 
encourage [in'kʌridʒ]

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vt. 鼓励,促进,支持

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particular [pə'tikjulə]

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adj. 特殊的,特别的,特定的,挑剔的
n.

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multiple ['mʌltipl]

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adj. 许多,多种多样的
n. 倍数,并联

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purchase ['pə:tʃəs]

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vt. 买,购买
n. 购买,购买的物品

 

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