Re: [考題] 102年鐵路特考工程數學:－2016徵求年菜推薦網路訂購最紅的商家.年菜訂購?台北年菜外送餐廳推薦(年菜)?年菜.今年不想做年菜推薦,網路宅配哪一家好?

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批踢踢實業坊 Examination 板

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Re: [考題] 102年鐵路特考工程數學

Oct 17th 2013, 20:12, by pigheadthree

作者pigheadthree (爬山)

看板Examination

標題Re: [考題] 102年鐵路特考工程數學

時間Thu Oct 17 20:12:52 2013

※ 引述《jokeking (笑話王)》之銘言： : 各位版友好~ : 我想請教102年鐵路特考高員 : 工程數學選擇題第9題，向量(線性代數)，求正交投影 : 題目如下: : http://wwwc.moex.gov.tw/ExamQuesFiles/Question%5C102/102080_70860(6708).pdf : 小弟太弱查書還是解不出來 : 懇請高手指導一下 : 謝謝~ (2,0,0) 與 (0,3,1) 為 S 子空間線性組合 = (2,0,0) + (0,3,1) = (2,3,1) 為線性相依其正交投影 (1,1,3) x (2,3,1) --- ↑ 叉積 |1 3| → |3 1| → |1 1| → |3 1| i + |1 2| j + |2 3| k → → → → → → = (1-9)i + (6-1)j + (3-2)k = (-8)i + 5j + 1k = (-8,5,1) = -(8)(1,-0.625,-0.125) 看不出來答案是哪一個？有錯請指正！ -- 水無常態，兵無常勢。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 125.224.236.142 ※ 編輯: pigheadthree 來自: 125.224.236.142 (10/17 20:24)

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