Re: [計量] A bowl contains red, green, ...

看板GRE (GRE入學考試)作者 (sfsdf)時間17年前 (2008/12/25 13:16), 編輯推噓1(100)
留言1則, 1人參與, 最新討論串2/3 (看更多)
※ 引述《Hide0916 (紅)》之銘言: : 1. A bowl contains red, green, and white balls. The probability of : choosing a red ball is 1/3.There are 5 more green balls than red : ones, and there are 12 white balls total. What is the odds against : chossing a white ball? : a.12/39 b.12/51 c.13/4 d.17/4 e.12/22 : Ans: C : 我算出來紅、綠、白球各是 17, 22, 12 顆 : 但是我實在不懂最後一句是甚麼意思??? : 2. Marigolds are to be planted inside a circular flower garden so that there : are 4 marigolds per square foot. The circumference of the garden is 20 feet. : If marigolds are available only in packs of 6, how many packs of flowers are : needed? : a.13 b.14 c.20 d.21 e.22 : Ans: E : 如果花園的周長是20的話 那麼面積不就是 (10/拍)^2 : 然後 (10/拍)^2 * 4 / 6 怎麼會是22呢??? : 這題怎麼算都怪怪的....是我理解錯誤嗎?? 圓面積是(10/拍)^2 * "拍" 再去乘4除6..結果是21.多 所以要22個 : 3.Which of the following express the area of a circle in terms of C, : its circumference?? : a. C^2/4拍 b.C^2/2拍 c. 根號C/2拍 d.c拍/4 e.C/4拍 圓半徑是 C / 2拍 面積就變成 (C / 2拍)^2 * 拍 = C^2 / 4拍 : Ans: A : 4. 若 1 < a < b < 2 要怎麼證明 a+b > ab 呢?? : 我快要考試了所以想解決對這些問題的疑惑 : 不知道要怎麼表達根號和拍 所以用文字表達 希望大家看得懂 : 非常感謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.192.37.171

12/25 15:21, , 1F
喔喔 第三題我懂了...我以為C代表的是圓面積 @_@
12/25 15:21, 1F
文章代碼(AID): #19KnSlAr (GRE)
文章代碼(AID): #19KnSlAr (GRE)