SAT数学真题精选.doc

SAT 数学真题精选 1. If2x+3= 9, what is the value of4x–3? (A) 5 (B) 9 (C) 15 (D) 18 (E) 21 2 . If 4(t + u)+3= 19, then t+u=? (A) 3 (B) 4 (C) 5 (D) 6 (E) 73 . In the xy-coordinate ( 坐标) plane above, the line contains the points (0,0) and (1,2). If line M (not shown) contains the point (0,0) and is perpendicular ( 垂直) to L, what is an equation of M? (A) y= -1/2 x (B) y= -1/2 x+1 (C) y=-x (D) y=-x+2 (E) y= -2x 4. IfK is divisible by 2,3, and 15, which of the following is also divisible by these numbers? (A) K+5 (B) K+ 15 (C) K+ 20 (D) K+ 30 (E) K+ 45 5 . There are 8 sections of seats in an auditorium. Each section contains at least 150 seats but not more than 200 seats. Which of the following could be the number of seats in this auditorium? (A) 800 (B) 1,000 (C) 1,100 (D) 1,300 (E) 1,700 6. If rsuv =1 and rsum = 0, which of the following must be true? (A) r<1 (B) s<1 (C) u= 2 (D) r=0 (E) m=0 7 . The least integer ofa set of consecutive integers ( 连续整数) is– 126. if the sum of these integers is 127, how many integers are in this set? (A) 126 (B) 127 (C) 252 (D) 253 (E) 254 8. A special lottery is to be held to select the student who will live in the only deluxe room ina dormitory. There are 200 seniors, 300 juniors, and 400 sophomores who applied. Each senior ’s name is placed in the lottery 3 times; each junior ’s name, 2 time; and each sophomore ’s name, 1 times. Ifa student ’s name is chosen at random from the names in the lottery, what is the probability that a senior ’s name will be chosen? (A) 1/8 (B) 2/9 (C) 2/7 (D) 3/8 (E) 1/2 SAT 考试数学练****题(一) 1. If f(x) =x2– 3, where x is an integer, which of the following could be a value of f(x)? I6 II0 III -6 only and II only C. II and III only and III only E. I, II and III Correct Answer: A 解析: Choice I is correct because f(x) =6 when x=3. Choice II is incorrect because to make f(x) = 0,x2 would have to be 3. But 3 is not the square of an integer. Choice III is incorrect because to make f(x) = 0, x2 would have to be –3 bu