close
Blogtrottr
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
Explore Cafepress

Name anything in the world, and we'll show you hundreds of products that celebrate it. Or, you can design your own.
From our sponsors
高二數學-圓與直線的關係
Nov 17th 2013, 08:47

直線4x-3y+c=0與x^2+y^2+dx+ey-20=0相切於A(-2,2),求數對(d,e)=?請不要用向量法向量求因尚未學到

Ans:

圓形一點切線方程式為:

0=Ax*x+Ay*y+d*(x+Ax)/2+e*(y+Ay)/2-20

=-2x+2y+d(x-2)/2+e(y+2)/2-20

=(-2-d/2)x+(2+e/2)y+(-d+e-20)

=-4x+3y-c

可以獲得3ㄍ方程式:

d/2+2=4 => d=4

e/2+2=3 => e=2

c=d-e+20

=> (d,e)=(4,2).....ans

This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers.
You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions
arrow
arrow
    全站熱搜
    創作者介紹
    創作者 奇摩商城 的頭像
    奇摩商城

    瑪法達2014星座運勢大預言, 2014星座運勢大預言星星王子, 2014星座運勢大預言 唐立淇, 唐立淇2014星座運勢大預言, 薇薇安2014星座運勢大預言

    奇摩商城 發表在 痞客邦 留言(0) 人氣()

    E-mail轉寄