作者查詢 / wxtab019
作者 wxtab019 在 PTT [ Math ] 看板的留言(推文), 共281則
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1F→: 先想5 5 5 分在兩個袋子7 8 個有幾種 然後再給兩人05/05 19:48
4F→: 可以想成 從5 5 5 三種球中 取出7個球有幾種取法05/05 20:05
5F→: or取出8個球有幾種取法 一樣05/05 20:05
1F→: 隨便哪裡? 範圍多大? 2^10000~2^10000000000呢05/05 13:50
3F→: (a+bi)^2=(a^2+2abi-b^2) 解二元一次聯立05/03 17:59
4F→: 說錯了 是2次05/03 18:00
1F→: 至少得一件 就每人先分一件 剩下再去H05/01 21:06
2F→: 說錯了05/01 21:07
3F→: 記得先扣掉分出去的05/01 21:09
4F→: 阿 兩種有一個就行 應該用排容就好05/01 21:16
5F→: 全部-一人沒-兩人沒=H3_7*H3_5-C2_1*(H2_7*H2_5)-05/01 21:18
6F→: +C3_2(H1_7*H1_5) +兩人沒 上面打錯05/01 21:19
1F→: 你的算法就是只有幾種擺法而已05/01 18:32
2F→: 不管不能放在同一列 同一行的規則了05/01 18:32
3F→: 等等 好像不是05/01 18:32
5F→: 他的列式是 先5中選4行/列 然後再5列/行選4出來排?05/01 18:35
7F→: 原PO的算法是一開始有25個位置 再來就扣掉該行列05/01 18:35
8F→: 一開始25個位置 扣掉一行一列剩16 剩9 剩405/01 18:37
7F→: /2 期望值也可以用上面這樣直接硬算阿04/30 12:18
1F→: 階乘04/29 20:38
3F→: https://zh.wikipedia.org/zh-tw/階乘04/29 20:47
5F→: 他意思就是 先排其他三個沒影響的人04/29 21:21
6F→: 三個人坐6個位置 有6!/3!種排法04/29 21:22
1F→: 可以重複選記得是取(ΣA)^n04/29 15:34
2F→: 不能重複就還要扣掉某些重複項04/29 15:34
3F→: 想法大概是(A1+A2+....+A10)(A1+...+A10) ....04/29 15:35
4F→: 取4個數字就是乘4次 不能重複的話就要扣掉重複項04/29 15:35
5F→: 重複像也可以合併阿04/29 16:01
6F→: 重複項04/29 16:01
7F→: 下面用ΣA代替(A1+A2+....+A10)04/29 16:03
8F→: (ΣA)^4-4(ΣA)*(ΣA^3)+3(ΣA)^2*(ΣA^2)-...04/29 16:04
9F→: 大概類似這樣 用+-+-的04/29 16:05
1F→: (A^2+A+I)=O又A≠I => (A^2+A+I)(A-I)=O04/29 15:20
2F→: => A^3-I=O A^3=I04/29 15:20
3F→: 反過來04/29 15:21
5F→: 喔 對 反過來好像不一定能04/29 15:26
1F→: 先選中間的 再選2,4位 再1,5位 還有對稱互換04/29 03:41
4F→: 中間是1 5 的話 兩邊有3個數字可以放 2 3 4 只有2個04/29 12:40