F3 maths question!!!
2011-02-04 12:29 am
圖片參考：http://imgcld.yimg.com/8/n/HA05329604/o/701102030042013873376772.jpg
In the figure,ABCD is a parallelogram,E is ap point lying on AB.If EC and BD intercept at F,find the ratio of the area of DEF to the area of CBF(HKCEE2007MC)
回答 (3)
2011-02-04 12:40 am
✔ 最佳答案
△DCE : △DCB = 1 : 1 (with the same height since AB//DC)Let △DCE = △DCB = kSo△DEF : △CBF= (△DCE - △BCF) : (△DCB - △BCF)= (k - △BCF) : (k - △BCF)= 1 : 12011-02-03 16:44:35 補充：
Typing error :
△DEF : △CBF
= (△DCE - △DCF) : (△DCB - △DCF)
(Not △BCF)
Sorry!
2011-02-03 16:50:17 補充：
You ' re welcome.Happy new lunar year!
2011-02-04 4:15 am
003You are correct!!
2011-02-04 12:30 am
3 pictures are same
2011-02-03 16:45:24 補充：
To ☂雨後陽光☀:
You are correct!!
2011-02-03 16:45:24 補充：
To ☂雨後陽光☀:
You are correct!!
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110203000051KK00420