[計量] 請教幾題數學

看板GRE作者sonatach (sonata)時間15年前 (2010/11/23 12:26)推噓2(2推 0噓 13→)

留言15則, 3人參與討論串5/6 (看更多)

1. Par drove to work from his home, averaging 40 miles per hour, and was 12 minutes late. The next day he left home for work at the same time, took the same route, averaging 48 miles per hour, and was 7 minutes late. How far in miles is it from Pat's home to his work? Ans: 20.0 題目的意思我了解但不知道怎麼列式... 2. If an employee deposited $2000 in a new credit union account and made a single $200 deposit during each month thereafter, after how many deposits will the employee have deposited a total of $ 10,000 in the credit union account? Ans: 41 這題一樣不知道怎麼列式 = = 3. If the smaller of 2 consecutive odd integers is a multiple of 5, which of the following could NOT be the sum of these 2 integers? (A) -8 (B)12 (C)22 (D)52 (E) 252 Ans: (C) 這題我設較小的奇整數為 5(2x+1) 那下一個奇整數該怎麼設? 因為我設 2x+3 的話算不出來... 是哪裡出錯了嗎? 4. If rt > st and r > s, then which of the following must be true? (A) t > 0 (B) s > 0 (C) r > 0 (D) t < 0 (E) rs > 0 Ans: (A) 5. If x < x的3次方 < x的平方, then which of the following could be the possible value of x? (A) -3/2 (B) -1/2 (C) 0 (D) 1/2 (E) 1/3 Ans: (B) 為什麼我覺得沒有一個答案是對的? = = 6. A candidate for public office allocated 1/3 of her campaign funds for television appearances, 2/3 of the remainder for personal appearances, and the balance for newspaper advertisements. If the amount allocated for newspaper advertisements was equally divided among 4 newspapers, what fraction of her original campaign funds was allocated for each newspaper? Ans: (A) 1/18 我想問這裡的balance是甚麼意思? 查了字典後還是不知道該怎麼做... 7. 0.0625y = x(2.5/4) Col A: x Col B: y Ans: D 可以算出 x 和 y的比值，但答案是D的原因是因為要考慮正負號嗎? 如果是的話，比值最後還是不能決定兩者誰大囉? 我想搞懂這個觀念... 8. If d>0 and 0 < 1- (c/d) < 1, which of the following must be true? I. c > 0 II. c/d < 1 III. c^2 + d^2 >1 Ans: I. and II. 前兩個我推得出來，但第三個不知道要怎麼導... 對不起問題有點多先謝過大家了! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.166.9.74 ※ 編輯: sonatach 來自: 218.166.9.74 (11/23 12:33)

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