[計量] 兩題計量

看板GRE作者 (dog)時間13年前 (2010/10/11 12:17), 編輯推噓2(2推 0噓 2→)
留言4則, 2人參與, 最新討論串5/13 (看更多)
1. Two successive discounts of 30 percent and 30 percent are equal to a single discount of P percent. Column A Column B P 49 Ans: A(my answer is B) my solution 30% x 30% =9% ???? 2.Column A The slope of the pertendicular bisector of line segment AB if A is (0,-3)and B is (0,4) Column B 3/4 Ans :B (my answer is C) my solution the slope of AB is -3/4, the pertendicular bisector of line segment AB is pertendicular to the line segment AB -3/4*4/3=-1 Therefore, The slope of the pertendicular bisector of line segment AB is 4/3 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.135.73.182
推
10/11 16:25, , 1F
1. (1-0.3) * (1-0.3) = (1-P%) => p = 51
10/11 16:25, 1F
→
10/11 16:26, , 2F
2. AB斜率無窮大, 與之垂直的線段斜率為0
10/11 16:26, 2F
推
10/12 12:15, , 3F
第一題應該是國外習慣用X% off，台灣習慣用打Y折
10/12 12:15, 3F
→
10/12 12:15, , 4F
所以才會搞錯
10/12 12:15, 4F
‣ 更多 acutedog 的文章
文章代碼(AID): #1Cie_BDz (GRE)
討論串 (同標題文章)
完整討論串 (本文為第 5 之 13 篇)：
排序： 最舊先 | 最新先 | 留言數
在新視窗開啟完整討論串 (共13篇)
‣ 更多 acutedog 的文章
文章代碼(AID): #1Cie_BDz (GRE)