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F3 maths question!!!

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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)

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△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 : 1 2011-02-03 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!

其他解答:

003You are correct!!|||||3 pictures are same 2011-02-03 16:45:24 補充: To ?雨後陽光?: You are correct!!
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