[計量] 數學問題~

看板GRE (GRE入學考試)作者hsingchih (請賜我GRE高分吧!!)時間18年前 (2007/10/31 22:14)推噓0(0推 0噓 0→)

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1. An emergency vehicle travels 10 miles at a speed of 50 miles per hour. How fast must the vehicle travel on the return trip if the round-trip travel times is to be 20 minutes? (A) 55 mph (B) 60 mph (C) 65 mph (D) 70 mph (E) 75 mph Ans: E 2. The sum of 2 numbers, x and y, equals twice their product. If x=3, what is the value of y? (A) 1/8 (B) 3/5 (C) 3/2 (D) 5/3 (E) 7/3 Ans: B 3. Among all isosceles triangles RST having the measure of angle S equal to 40。, what is the largest possible measure for angle R? (A) 40。 (B) 70。 (C) 90。 (D) 100。 (E) it cannot be determined from the information given. Ans:D 4. S is the sum of three consecutive integers, the greatest of which is x. In terms of S, which of the following is the sum of three consecutive integers, the least of which is x? (A) S-6 (B) S-3 (C) S+3 (D) S+6 (E) 2S Ans: D 不知道那做錯了, 設三個數分別為 x, x-1, x-2 x+(x-1)+(x-2)=S 3x-3=S 3x=S+3 x=S+3/3 是我誤解題目的意思嗎?? 請高手幫幫忙~~謝謝~ 5.Circle F has circumference 4 Cloumn A The radius of F Cloumn B 1 Ans: B Cloumn A 不是應該為4/1.414=2.8 半徑=1.4嗎? 為什麼答案會是Cloumn B比較大呢? 6. r/s= -1 Cloumn A r+s/s Cloumn B rs Ans: A 7.Nine pieces of paper numbered consecutively from 1 to 9 are put into a hat. If one piece of paper is drawn at random from the hat, what is the probability that it will have an even number? (A) 1/9 (B) 2/9 (C) 4/9 (D) 1/2 (E) 5/9 Ans: C 機率問題完全不知道該如何回答,請高手教教我如何解答機率題~謝謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.112.22.164