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作者 thisday 在 PTT [ Math ] 看板的留言(推文), 共559則
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3F推:其實| 1 - wn |可以從圖形快速看出來喔!!10/12 02:17
4F→:這是個好方法 也該M ^^10/12 02:17
5F→:當然用計算的用到半角公式也很快啦@@10/12 02:20
8F→:上上篇有M 這篇怎沒M...10/13 13:59
1F推:直接出這一題感覺很難想到QQ10/09 13:52
2F→:我記得以前第一次看到這題時10/09 13:52
3F→:有要先做第一小題 1 + ab > a + b10/09 13:52
4F→:這樣感覺比較好想10/09 13:52
6F推:應該就如5F所說QQ09/25 20:39
13F推:回樓上 Dorapedia大不就已經解出來了...09/14 09:08
65F推:http://www.books.com.tw/products/001048752309/13 22:26
66F→:作者資訊如網頁所示09/13 22:27
67F→:數學系...09/13 22:27
1F推:http://goo.gl/q92uhk09/02 18:09
3F→:如XII大所言 8個三角形沒錯 稍微畫一下就知道了^^09/03 10:55
4F→:可以想像最簡單的情況 一個球砍三刀 變成八分!09/03 10:56
5F推:1/8?08/31 21:54
6F推:慢走08/29 11:38
42F推:利用 x<-208/17 16:14
43F推:x= [ -t^2±√(9y^4-8) ] / (2y^2-2 )08/17 16:18
44F→:就可以算出08/17 16:18
45F→:y<-108/17 16:19
46F→:抱歉 我的y就是這邊的t !!!08/17 16:19
47F→:所以這的確是高中範圍^^08/17 16:20
48F→:另外 圖形左邊部分應該是遞減喔08/17 16:20
49F→:http://goo.gl/BkrGSB08/17 16:30
52F→:哪邊不懂呢??08/17 19:47
56F→:[-t^2±√(9t^4-8)] / (2t^2-2 ) < -208/18 10:44
57F→:解這個不等式 討論一下範圍 即可算出 t<-108/18 10:46
4F推:1,2F的方法都很好^^07/30 18:24
6F→:對齁07/30 19:41