maths~~~~
2010-04-05 12:12 am
圖片參考：http://j.imagehost.org/0507/ScreenHunter_06_Apr_04_16_06.gif
http://j.imagehost.org/0507/ScreenHunter_06_Apr_04_16_06.gif
回答 (1)
2010-04-05 12:19 am
✔ 最佳答案
Area of DCB=CD x BD x 1/2Area of ADC=CD x AD x 1/2
Since Area of DCB=Area of ADC x 2
CD x BD x 1/2=CD x AD x 1/2 x2
BD x 1/2=AD
AD/BD=1/2
AD:BD=1:2
Therefore, the answer is A
收錄日期: 2021-04-23 20:43:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100404000051KK00847