Re: [計量] OG 90-16,90-17幾題請教

看板GRE (GRE入學考試)作者bubbb (bubbb)時間17年前 (2008/09/07 01:03)推噓1(1推 0噓 2→)

留言3則, 2人參與討論串1/1

※ 引述《mlhchc (追求簡單的幸福)》之銘言： : 希望有好心人替我解答一下, 如果可以的話請告訴我以下這幾題的中文意思是什麼@@? : 感謝!!! : <90-16> : P.200 : 15. S is the set of all fractions of the form n/n+1,where n is a : positive integer less than 20. : A. The product of all the B. 1/20 : fractions that are in S S長這樣 n/n+1 (0 < n < 20) A是說所有的S乘積所以就是 1/2 * 2/3 * 3/4 * ... * 18/19 * 19/20 └─┘└─┘ └──┘ ↑消去↑ ...(中間也消去) ↑消去分子分母消去之後會剩下 1/20 所以A跟B是相等 : P.207 : 8.The total savings on 20 gallons of $1.80 : gasoline purchased for $1.169 per : gallon instead of $1.259 per gallon. 購買20加崙的汽油如果單價以$1.169購買可以比單價以$1.259購買省下多少錢 20 * (1.259 - 1.169) = 20 * 0.09 = 1.8 所以A跟B是相等 : <90-17> : p.230 (此題圖表題,可能要麻煩參考.230) : 25. in 1977, if twice as many anesthesiologists are orthopedists were : sued for malpractice and 10 percent of the orthopedists were sued, : approximately what percent of the anesthesiologists were sued? : (A)5% (B) 9% (C)18% (D)22% (E)25% : p.241 : 8. A merchant made a profit of $2.75 on the sale price of a sweater that : cost the merchant $12.25. : A. The profit expressed as B.The profit expressed as a percent : of the sale price : a percent of the cost to : the merchant 商人賺了$2.75 他的成本是$12.25 所以他的售出價格是 12.25 + 2.75 = 15元 A是說將利潤用percent表示利潤跟成本比 2.75 / 12.25 = 0.2245 B是說將利潤用percent表示利潤跟售價比 2.75 / (12.25 + 2.75) = 0.1833 所以A大於B -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 198.172.210.48 ※ 編輯: bubbb 來自: 198.172.210.48 (09/07 01:05) ※ 編輯: bubbb 來自: 198.172.210.48 (09/07 01:11)