Re: [討論] 請問幾題數學

看板GRE (GRE入學考試)作者tseng33 (曾33)時間18年前 (2007/09/04 15:28)推噓1(1推 0噓 0→)

留言1則, 1人參與討論串2/2 (看更多)

※ 引述《Arus ()》之銘言： : 1. : Big Book的P.543 11題比大小 : A certain car gets 24 miles per gallon of gasoline for city driving, : which is 60 percent of the number of miles per gallon of gasoline the : car gets for high way driving : (A) The number of gallons of gasoline used to drive this car 30 miles : in the city : (B) The number of gallons of gasoline used to drive this car 45 miles : on the highway : 答案是A，不過題目看不太懂 1 加崙汽油可跑 24 miles for city driving 24*100/60=40 => 1 加崙汽油可跑 40 miles for high way driving a. 30/24 b. 45/40 : 2. : B Book p.605 15題比大小 : John has a flat square garden with a perimeter of x feet.David has a flat : rectangular garden with a perimeter of x feet and the length 1 foot longer : than the width. : (A)The area of John's garden (B)The area of David's garden : 答案是A，這題想問的是，是不是只要周長相同的正方形及長方形面積比較， : 一定是正方形面積比較大? : 3. : B Book p.665 14題比大小 : A certain store sells each pencil at the same price regardless of the number : of pencils sold.k of these pencils have a total price of q cents, and r of : these pencils have a total price of s cents. : (A)ks (B)qr : 答案是C，指兩邊一樣大，題目不是說不論買幾隻筆每隻價錢都一樣嗎？如果是這樣答案不 : 是應該是D嗎？還是他的意思是不論買幾隻筆總價都一樣？是說不論買幾隻筆每隻價錢都一樣 k*價錢=q r*價錢=s q/k=s/r ks=qr : 4. : B Book p.760 30題 : 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 time is : to be 20 minutes? : (A)55mph (B)60mph (C)65mph (D)70mph (E)75mph : 答案是E，題目不太懂，他說去程10miles以速度50miles/hr開，回程以20分鐘開完 : ，那不是速度要更慢嗎？是說整個比賽時間限制是20分鐘 60*(10/50)=12 20-12=8 回來只能花8分鐘 10/8*60=75 : 5. : B Book p.992 27題 : W : ─┌──────────┐ Top of Page : ↑│ │ : │├──────────┤ : ││ │ │ │ : ││ │ │ │ : H │ │ │ │ : ││ │ │ │ : ││ │ │ │ : ││ │ │ │ : ↓│ │ │ │ : ─└──────────┘ Bottom of Page : The figure above shows the dimensions of a page that has been divided into : four rectangular advertising spaces of equal area.What is the height, in : terms of h, of one of the advertising spaces at the bottom of the page? : (A)1/4 h (B)1/3 h (C)1/2 h (D)2/3 h (E)3/4 h : 答案是E，題目是說每個長方形的長跟寬都一樣嗎？不會解.. : 希望各強者幫我解答，感謝~ 是說每個長方形面積都一樣 w/3*(h-x)=wx h=4x h-x=3/4h 希望沒有解錯 @@ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.96.146.108