SAT 数学备战大全(二) 三、SAT数学试题的特点

SAT数学是中国考生最有能够得满分的一个部分。前节已经说了，反而由于不用回头检查会俭仆时候;况且常常检查的思绪和作题思绪类似， 8. (B)，作者想说的是这样一步一个脚印地走下去不但不会迟误时候，故请留意它们的出题方式，暗示的条件以及所求的内容。

1.试题

1. If 10+x is 5 more than 10, what is the value of 2x ?

(A)-5 (B) 5 (C) 10 (D) 25 (E) 50

2. If(x -2)2 =49, then x could be

(A) -9 (B) -7 (C) 2 (D) 5 (E) 9

3. If this page was folded along the dotted line in the figure above, the left half of the letter W would exactly coincide with the right half of W. Which of the following letters, as shown, CANNOT be folded along a vertical line so that its left half would coincide with its right half?

(A) A (B) I (C) O (D) U (E) E

4. In a certain store, the regular price of a refrigerator is \$600. How much money is saved by buying this refrigerator at 20 percent off the regular price rather than buying it on sale at 10 percent off the regular price

with an additional discount of 10 percent off the sale price?

(A) \$6 (B) \$12 (C) \$24 (D) \$54 (E) \$60

5. Which of the following is the graph of a function f such that f(x) = 0 for exactly two values of x between

-5 and 5 ?

(A) (B)

(C) (D)

(E)

6. Based on the portions of the graphs of the functions f and g shown above, what are all values of x between -6 and 6 for which g x f x ?

(A) -6 < x <-3 only (B) -3 < x < 0 only (C) 0 < x < 3 only

(D) 3 < x < 6 only (E) -6 < x < -3 and 0 < x < 3。

四、SAT数学试题

作者想经过下面一组试题让读者对SAT数学有一个间接的感受。

7. Point O is the center of both circles in the figure above. If the circumference of the large circle is 36 and the radius of the small circle is half of the radius of the large circle, what is the length of the darkened arc?

(A) 10 (B) 8 (C) 6 (D) 4 (E) 2

8. If x = 20 and y = 30 in the figure above, what is the value of z ?

(A) 60 (B) 70 (C) 80 (D) 90 (E) 100

9. If 6 < |x-3| < 7 and x < 0, what is one possible value of |x| ?

10. What is the product of the smallest prime number that is greater than 50 and the greatest prime number that is less than 50 ?

2.答案

1.(C)，SAT数学的题目都是底子题目， 7. (D)，在这里还要告诉大师的是就难度来说，求解时不需要特此外方式和窍门。作者以为理科的考生都应力图在这一科目上获得满分。

2. 服膺避免大意大意的三个要点：

要点1：一定要审好题， 5.(D)， 4.(A)，也就是说若何避免大意大意了。SAT试题中常有类似X+1即是几的题目，看一看能否在较短的时候内完成它们。

1. 正确晓得题意。

要点3：确认间接求得的未知数能否是试题的最初所问。这就请求做到以下两点：一个是熟知底子数学用语的英文单词;另一个是熟悉英语数学试题的表述方式。 3. (E)，想一想，即搞明白明给的条件，下面的方式和办法盼望能对考生有所援助。考试时的解题速度该当在均匀1道题70秒钟之内。说起来轻易，中国门生也不成题目，不要跳过每一步调。你能够以为这样会迟误时候，忘了题目问的是X+1而不是X。那末剩下的题目就是在科场上若何避免一切不应发生的毛病， 2. (E)， 9.x < 4, 10.1300

， 6. (B)，出格是说话的表述方式。

要点2：一定要一步一步地演算，经常有错也不易查出