作者查詢 / jetzake
作者 jetzake 在 PTT [ Math ] 看板的留言(推文), 共525則
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8F推:這個是Geogebra產生的 (網頁形式) 有主程式比較好辦11/25 07:09
9F→:然後 其實他就是一般拋物線的作法而已....= =A11/25 07:10
10F→:從B點的移動方式就漏餡了11/25 07:10
11F推:這其實相當於"以圓心為焦點 以已知直線遠離圓心一個11/25 07:20
12F→:半徑的距離取準線 然後做拋物線" 這樣11/25 07:21
13F→:或是更直觀 距離這條線取距離"d" 圓半徑為"r"11/25 07:22
14F→:收集所有"與圓心距離為直線距離+r"的點就是圖形11/25 07:24
15F→:http://i.imgur.com/7694Q.jpg <==這是GSP做的11/25 07:35
16F→:他的作法應該跟這差不多11/25 07:35
17F→:要畫出新的直線和那個圓都是後話 不是重點11/25 07:36
1F推:第一題應該要加入"ABCDEF各自不同"這個條件??11/24 00:57
2F→:第二題直接算"多久以後會差12小時"就好11/24 00:58
4F→:是的 如果沒加條件 硬寫333333*3也不能算錯11/24 01:03
150F推: 騜 <==樓上錯字11/23 03:08
2F推:分割\合併以後可以變成四正三角形和四個弓形11/21 06:15
3F→:雖然有點囉唆 但應該還是可以處理才對11/21 06:16
1F推:查一下"有理數可數"的証明就有答案了11/14 17:08
2F→:也就是說 這應該算是老梗的範圍才對...11/14 17:09
2F→:或者可以說 9:16這樣..11/06 05:28
3F→:這邊其實不用算 可以証出O1PMQ和MRO2Q相似11/06 05:30
1F推:姆...g(2)=6好像... 然後其實g(x)不太重要09/25 08:05
2F→:重點是f(x)=(x-2)g(x)-x =>f(2)=-2 這樣09/25 08:06
3F→:有f(2)=2 四個問題的答案都很好代出來09/25 08:07
4F→: f(2)=-2... 修正一下 = =A09/25 08:08
1F→:應該是有少條件或是題目出錯 因為...09/25 07:52
2F→:或者說 不要解f(x) 直接代一組合條件的f(x)去算就是09/25 07:56
3F→:如果解出來不對 那就是題目有問題 不理他就好 = =+09/25 07:56
5F推:其實一樓就是解了 LPH66兄說的比較是證明的部份09/15 03:08
6F→:橢圓本身的定義就是"與兩個焦點距離和為定值的點..09/15 03:08
7F→:..所成的集合"這樣09/15 03:09
8F→:很多人會在實作題目的時候忘記這東西09/15 03:09