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标题: [求助]请教几道数学题 [打印本页]

作者: i92 时间: 2008-2-6 11:25
标题: [求助]请教几道数学题

请教几道数学题

求助大牛们

For which of the following functions f is f (x) = f (1 - x) for all x ?

(A) f (x) = 1 - x

(B) f (x) = 1 - x^2

(D) f (x) = (x^2)(1 - x)^2

Ans

In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. Which of the following gives the dealer's price per gallon d in terms of the price per gallon p charged at the pump?

(A) d = p - 0.22

Ans: 想了解式子怎么列
(形式如A选项)

Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that country whose annual income is I ?

Ans: 想了解式子怎么列

作者: 258828632 时间: 2013-8-19 19:49
第二题是prep里原题

In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. Which of the following gives the dealer's price per gallon d in terms of the price per gallon p charged at the pump?

(A) d = p - 0.22
(B) d = P/ 1.22
(C) d = (P/1.04) – 0.18
(D) d = (P - 0.18)/1.04
(E) d = (P-0.04)/1.18

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