依條係培正數學比賽以前的題目..
有關幾何的問題..
link: http://www.2and2.net/files/49787754c56ca.bmp
依條答案係 9..
我想知個步驟..
可唔可以講個步驟同埋解釋埋比我聽呀??
thx!
一條F.4培正數學比賽問題..有關幾何
2009-01-23 5:49 am
回答 (1)
2009-01-23 6:27 am
✔ 最佳答案
連CE,△AEC是直角△,AC^2 = AE^2+CE^2 = 3^2+5^2=34連DB,△ADB是直角△,AB^2= AD^2+DB^2 = 3^2+4^2=25
所以AC^2 - AB^2 = 34-25 = 9
收錄日期: 2021-04-21 22:02:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090122000051KK01735