[計量] 請教一題數學

看板GRE作者 (兔子寶*)時間16年前 (2009/10/08 00:15), 編輯推噓3(304)
留言7則, 5人參與, 最新討論串17/21 (看更多)
OG p.245的第30題: A certain recipe makes enough batter for exactly 8 circular pancakes that are each 10 inches in diameter. How many circular pancakes, each 5 inches in diameter and of the same thickness as the 10-inch pancakes, should the recipe make? (A)4 (B)16 (C)24 (D)32 (E)40 答案是D,可是我怎麼算都是B(16個)耶, 希望各位來幫我解答一下> <...thx -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.167.206.184

10/08 00:50, , 1F
因為是面積,所以是4倍..
10/08 00:50, 1F

10/08 00:51, , 2F
高度一樣,則體積=3.14xR^2xh, h相同,故R=5跟2.5
10/08 00:51, 2F

10/08 00:51, , 3F
差四倍
10/08 00:51, 3F

10/08 01:07, , 4F
樓上正解
10/08 01:07, 4F

10/08 01:10, , 5F
10^2-5^2 每個10"可多做3個5" 8+3*8=32
10/08 01:10, 5F

10/08 01:57, , 6F
四分之一﹐倍數是直徑比率的平方
10/08 01:57, 6F

10/08 02:43, , 7F
謝謝大家的幫忙^++++++^*
10/08 02:43, 7F
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文章代碼(AID): #1ApBwPZt (GRE)