數學題, (有圖) - Ans.fyi 參考答案

數學題, (有圖)

[匿名]

2009-07-24 11:58 pm

http://b16.photo.store.qq.com/http_imgload.cgi?/rurl4_b=e3dc1b1489e1bf4151dc024d536fa9a18636bcf78802a0f1c587da6e6189805fa80fb885b7229bd68fa4f7cb5f67f68d9bd23be46121a4767e0b07d846724e45abd55ae6c44611f438ecd52c530ec40c4dadca0e

圖中,若AB┴ AD及BC//AD,求

(a) y的值。

(b) C的坐標。

更新1:

http://photo.qq.com/portal/albumMain.shtml?1.0.2.2#uin=417060512&albumid=6b1d6007-a6ac-4eb6-91b3-8ac2766510de&lloc=MzMlbNHPOEhJhOBWRqatJFRnFJEJ.7EAAA!! 圖的網址~~ ~~

更新2:

http://photo.qq.com/portal/albumMain.shtml?1.0.2.2#uin=417060512&albumid=6b1d6007-a6ac-4eb6-91b3-8ac2766510de&lloc=MzMlbNHPOEhJhOBWRqatJFRnFJEJ.7EAAA!! 圖片的網址!!!!!

回答 (3)

用戶9112

2009-07-25 7:21 am

✔ 最佳答案

(a)
AD的斜率為 [1 - (-4)]/[4-(-1)] = 5/5 = 1
AB的斜率 = -1 = (y-1)/(3-4)
-1 = (y-1) / (-1)
y – 1 = 1
y = 2
(b)
設C點的坐標為(x,0)
BC的斜率 = 1 = (2 – 0)/(3 – x)
1 = 2/(3 – x)
3 – x = 2
x = 1
C點的坐標為(1,0)

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[匿名]

2009-07-25 12:38 am

= =""但系我試過,開到bor~

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Prof. Physics

2009-07-24 11:59 pm

圖開不到

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