SAT數(shù)學(xué)解析:試題舉例.

SAT數(shù)學(xué)解析:試題舉例 作者想通過(guò)下面一組試題讓讀者對(duì)SAT數(shù)學(xué)有一個(gè)直接的感受。這些題目均來(lái)自SAT考試試題，故請(qǐng)注意它們的出題方式，難易程度，特別是語(yǔ)言的表述方法。希望讀者讀一讀，想一想，做一做。如果你的英語(yǔ)基礎(chǔ)比較好，看一看能否在較短的時(shí)間內(nèi)完成它們?？荚嚂r(shí)的解題速度應(yīng)該在平均1道題70秒鐘以?xún)?nèi)。 1．試題 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 lt 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 lt 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 rrigerator is $600. How much money is saved by buying this rrigerator 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 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 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), 2. (E), 3. (E), 4.（A）, 6. (B), 7. (D), 8. (B), 9.x < 4, 10.1300