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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1F→:30題那邊 考慮直三橫三的組合 再各自排列就好07/07 01:40
2F→:25題可能要限定直走橫走都是偶數條 一樣排列組合07/07 01:43
3F→:例如直走6條 橫走2條可以 直4橫4也可以...07/07 01:45
4F→:但直6橫4這種就不行 各自列出再計算會簡單一些吧?07/07 01:46
5F→:或者 先討論最短路徑 再加上"4的倍數次"的行走路徑07/07 01:48
6F→:也就是總共只能是4、8、12歩 (12歩又確定不行..)07/07 01:49
7F→:這時候直接討論4歩(最短路徑)和直6橫2、直4橫4就好07/07 01:50
8F→:阿勒 四的倍數是錯的...先別管這個...= =a07/07 01:51
9F→:總之 就是先討論最短路徑 再加上可以來回的方式這樣07/07 01:54
10F→:25題是9+9-6+2=14種是嗎?07/07 02:01
3F推:這就是教學生觀念的問題啦 是說 怎麼會來這問這種的11/24 04:16
7F推:不需要矩陣啦 對稱本身的定義就是幾何性的11/20 18:02
8F→:嚴謹一點最多在寫個證明就是11/20 18:02
4F推:文組的大多不會學非歐幾何是事實11/18 15:46
5F→:這位老師話說的誇張了點 但還不算虎爛啦..11/18 15:47
6F→:會牽扯到數學定義本身的意義 大概也只有數學系本家11/18 15:48
7F→:深究這些事情 在數學以外的範圍是不太有幫助的11/18 15:49
10F推:這樣的簡化並不會造成誤判或計算上的困擾 無所謂吧10/11 08:51
3F推:AH垂直切下來 5-12-13和9-12-15兩個三角形可以看出來10/10 03:18
4F→:剩下就用相似形去算DE和FG的長度了10/10 03:19
5F→:簡單說 這種題目算是"做的題目夠多就可以猜到答案"的10/10 03:20
6F→:雖然這種方式對教學來說不太好 但考試就是...10/10 03:20
7F→:故意出這種題目其實不太值得鼓勵...10/10 03:21
9F→:ADC和ACD都是直角 有這個就簡單多了10/05 00:21
15F推:ADC是直角嗎? 這點應該需要證明一下...??10/04 22:52
16F推:這講法沒問題啊 除非確定y是變數 否則就可以當常數看10/03 14:25
17F→:微分也是同一回事 確定是常數的東西用什麼符號無所謂10/03 14:26