------------------------------------------------------------------------------------------------------------------------------------ 【答案】D
【思路】f(1)=(f1-1)=f(0) 要找出代1或0出來的數都相等 A f(1)=1-1=0, f(0)=1-0=1 that is to say, f(1)不相等f(0) B f(1)=1-1^2=0, but f(0)=1-0=1 f(1) 不相等 f(0) C f(1)=1, but f(0)=-1 f(1) 不相等 f(0) D f(1)=0, f(0)=0 f(1) 相等 f(0)
------------------------------------------------------------------------------------------------------------------------------------ 169. 17796-!-item-!-187;#058&011312
The total price of a basic computer and a printer was $2,500. If the same printer had been purchased with an enhanced computer whose price was $500 more than the price of the basic computer, then the price of the printer would have been [?] of that total. What was the price of the basic computer?
(A) $1,500 (B) $1,600 (C) $1,750 (D) $1,900 (E) $2,000 170. 18117-!-item-!-187;#058&011424
Of the 13 employees in a certain department, 1 has an annual salary of $38,000, 2 have an annual salary of $45,000 each, 2 have an annual salary of $42,500 each, 3 have an annual salary of $40,000 each, and 5 have an annual salary of $48,500 each. What is the median annual salary for the 13 employees?
(A) $38,000 (B) $40,000 (C) $42,500 (D) $45,000 (E) $48,500
------------------------------------------------------------------------------------------------------------------------------------ 【答案】D
【思路】13個人的中位數7 所以落在$45000的族群
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Julia purchased a car on an installment plan. She made a down payment of $2,550 and then made n monthly payments of $155 each. If Julia paid a total of $9,060 for the car, how many monthly payments did she make?
(A) 30 (B) 36 (C) 42 (D) 48 (E) 54
------------------------------------------------------------------------------------------------------------------------------------ 【答案】C 【思路】
9060?2550?42
155------------------------------------------------------------------------------------------------------------------------------------ 172. 18209-!-item-!-187;#058&011433
A metal company's old machine makes bolts at a constant rate of 100 bolts per hour. The company's new machine makes bolts at a constant rate of 150 bolts per hour. If both machines start at the same time and continue making bolts simultaneously, how many minutes will it take the two machines to make a total of 300 bolts?
(A) 36 (B) 72 (C) 120
(D) 144 (E) 180
------------------------------------------------------------------------------------------------------------------------------------ 【答案】B
【思路】設n minutes
------------------------------------------------------------------------------------------------------------------------------------
100150n?n?300 n=72 6060173.
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)/1.18 174. 18305-!-item-!-187;#058&011469
The main ingredient in a certain prescription drug capsule costs $500.00 per kilogram. If each capsule contains 600 milligrams of the ingredient, what is the cost of the ingredient in a capsule? (1 kilogram = 10^6 milligrams)
(A) $0.30 (B) $0.83 (C) $1.20 (D) $3.00 (E) $3.33 【答案】B 【思路】
18259-!-item-!-187;#058&011463
500?600?0.3
1000000 175. 18356-!-item-!-187;#058&011490
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 ?
(A) (B) (C) (D) (E) 176. 18407-!-item-!-187;#058&011575
If the operation ? is defined for all integers a and b by a?b = a + b - ab which of the following statements must be true for all integers a, b, and c ?
(A) I only (B) II only
