根據下圖,請以英文回答6及9題
圖↓
http://i167.photobucket.com/albums/u159/karycheung-1994/math3.jpg
英文平行線及垂直線分點數學題2(20分)
2009-03-30 1:56 am
回答 (1)
2009-03-30 2:21 am
✔ 最佳答案
6.set AP：y-5=-1/2(x+1) through P(a,b)
so b-5=-1/2(a+1)
so 2b-5= - a-1
so a= - 2b+4
9.
slope of AC is P=(5+1)/(1+2)=2
slope of BD is Q=(k-2)/(-10+6)=-(k-2)/4
since P*Q=-1
so 2*[-(k-2)/4]=-1
so (k-2)/2=1
k=4
收錄日期: 2021-04-23 20:15:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090329000051KK01529