题库 | 考满分，百万出国党的口碑之选。

序号	题目内容
21	If a = 1 and b = -2, then (2$${a}^{2}$$ + b)(x + y) + (a + b)(x - y) =
22	The formula F = 9C/5 + 32 gives the relationship between the temperature in degrees Fahrenheit, F, and the temperature given in degrees Celsius, C. If the temperature is 85 degrees Fahrenheit, what is the temperature, to the nearest degree, in degrees Celsius?
23	For the 5 days shown in the graph, how many kilowatt-hours greater was the median daily electricity use than the average (arithmetic mean) daily electricity use?
24	In a certain game, the units of currency of three countries are the crown, the shield, and the pound, respectively. If 2 crowns equal 3 shields and 3 shields equal 4 pounds, how many crowns equal 18 pounds?
25	if $$a>{b}>0$$, then $${\sqrt{{a}^{2}-{b}^{2}}}=$$?
26	There are 10 children in a company's day-care center, and a pair of children is to be selected to play a game. At most, how many different pairs are possible?
27	38, 69, 22, 73, 31, 47, 13, 82Which of the following numbers is greater than three-fourths of the numbers but less than one-fourth of the numbers in the list above?
28	If xy = 1, what is the value of $$\frac{{2}^{(x+y)^2}}{{2}^{(x-y)^2}}$$ ?
29	$${(1+0.0001)}\over{(0.04+10)}$$The value of the expression above is closest to which of the following?
30	A furniture dealer purchased a desk for $150 and then set the selling price equal to the purchase price plus a markup that was 40 percent of the selling price. if the dealder sold the desk at the selling price, what was the amount of dealer's gross profit from the purchase and the sale of the desk?
31	The circle shown has center O and radius 4. What is the area of the shaded region?
32	At a certain university, the ratio of the number of teaching assistants to the number of students in any course must always be greater than 3:80. At this university, what is the maximum number of students possible in a course that has 5 teaching assistants?
33	If $${x}^{4}+{y}^{4}$$ = 100, then the greatest possible value of x is between
34	Of the following, which is least?
35	What is the sum of the different positive prime factors of 550 ?
36	In a certain deck of cards, each card has a positive integer written on it. In a multiplication game, a child draws a card and multiplies the integer on the card by the next larger integer. If each possible product is between 15 and 200, then the least and greatest integers on the cards could be
37	for any integer k from 1 to 10, inclusion, the kth of a certain sequence is given by $$(-1)^{k+1}(\frac1 {2^k})$$. If T is the sum of the first 10 terms of the sequence, then T is:
38	Three grades of milk are 1 percent, 2 percent, and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3 percent grade are mixed to give x + y + z gallons of a 1.5 percent grade, what is x in terms of y and z ?
39	A certain stock exchange designates each stock with a one-, two-, or three-letter code,where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitute a different code, how many different stocks is it possible to uniquely designate with these codes?
40	Six machines, each working at the same constant rate, together can complete a certain job in 12 days. How many additional machines, each working at the same constant rate,will be needed to complete the job in 8 days?

序号

题目内容

If a = 1 and b = -2, then (2$${a}^{2}$$ + b)(x + y) + (a + b)(x - y) =

The formula F = 9C/5 + 32 gives the relationship between the temperature in degrees Fahrenheit, F, and the temperature given in degrees Celsius, C. If the temperature is 85 degrees Fahrenheit, what is the temperature, to the nearest degree, in degrees Celsius?