高中圓與直線:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

Blogtrottr

Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決

How to Make, Market, and Sell eBooks

Essential and free e-publishing methods to market ebooks at major retailers and personal sites/blogs. Sign up for this online course for just $29.

From our sponsors

高中圓與直線

Nov 1st 2013, 15:23

1. 以截距式令L之直線方程式為 (x/a) + (y/b) = 1 ，由算幾不等式得 x/a = y/b時，xy/ab 有最小值1/4，此時 ab = 8 且 a/b = 1/2 ，得 a = 2 ， b = 4 ，三角形面積最小值4，此時L之方程式為 (x/2) + (y/4) = 1 。
2. 平面三直線無法圍成三角形有兩種情況：一種為三直線交於一點，另一種為存在兩平行直線。解L1、L2聯立方程，得L1與L2交於(2,-1)，代入L3的符合前者敘述時 a = 4 ；而關於後者敘述，已知L1、L2不平行，L1與L3互相平行時 a = 3/2 ，L2與L3互相平行時 a = -6 。故所求 a = 4 or 3/2 or -6 。
3. 由點斜式 y + 3 = m(x - 2) 可推知此直線必通過點P(2,-3)。PA斜率為1，PB斜率為-1/3，將P、A和B三點繪於平面直角座標可觀察得，所求「m>1 或 m<(-1/3)」。

參考資料自己

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. Five Filters recommends:

Massacres That Matter - Part 1 - 'Responsibility To Protect' In Egypt, Libya And Syria
Massacres That Matter - Part 2 - The Media Response On Egypt, Libya And Syria
National demonstration: No attack on Syria - Saturday 31 August, 12 noon, Temple Place, London, UK

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