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作者 emptie 在 PTT [ Math ] 看板的留言(推文), 共270則

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[其他] 同餘問題兩題

[ Math ]7 留言, 推噓總分: +1

作者: tonyhawk320 - 發表於 2022/05/02 14:33(2年前)

1^F推emptie: 1 是3的倍數但不是9的倍數所以不是完全平方數05/02 15:01

2^F→emptie: 2 其實就是每次加入8顆球或8顆球的倍數05/02 15:01

3^F→emptie: 最後的總數一定會是9+8n的形式05/02 15:02

[中學] 數學算法求公式，數個正方格有幾個三角

[ Math ]5 留言, 推噓總分: +1

作者: atayal303 - 發表於 2022/04/30 13:01(2年前)

1^F推emptie: 三角形 m(n+1)+(m+1)n 圓形 (m+1)(n+1)04/30 13:07

2^F→emptie: https://i.imgur.com/jCHoSna.jpg04/30 13:08

[中學] 幾何

[ Math ]12 留言, 推噓總分: +5

作者: blackymys - 發表於 2022/04/23 22:45(2年前)

6^F推emptie: 你要把點對直線映射的動作想成在圓周上的角度加減04/24 01:24

7^F→emptie: A+2(M-A)= N+2(N-B) 得2(M-N)= A-B04/24 01:27

8^F→emptie: 其中tan M = m , tan N =N ,04/24 01:27

9^F→emptie: tan A = 17/15 , tan B = 15/1704/24 01:27

10^F推emptie: 我寫錯了 A+2(M-A)= B+2(N-B)04/24 01:34

排組一題

[ Math ]24 留言, 推噓總分: +12

作者: night72 - 發表於 2022/04/05 10:00(2年前)

10^F推emptie: 因為每一組算出來x>y的都有對應一組對調y>x的04/05 12:43

12^F→emptie: 而且等於只會發生在x=y=245000時04/05 12:43

19^F推emptie: 你考慮a1 a2相等的情況04/05 14:21

20^F→emptie: 這時候並不是每組abc都有對應8種排列的04/05 14:21

Re: [中學] 排列組合一題

[ Math ]5 留言, 推噓總分: 0

作者: emptie - 發表於 2022/03/29 22:24(2年前)

4^F→emptie: 啊…03/29 23:44

[機統] 擲骰子問題

[ Math ]3 留言, 推噓總分: 0

作者: goddamnwho - 發表於 2022/03/28 13:52(2年前)

1^F→emptie: 當作含有相同物的直線排列問題去解03/28 13:57

2^F→emptie: 四同+四同 [C(6,2)*(8!/(4!*4!))] / 6^803/28 14:05

[中學] 一題指數

[ Math ]6 留言, 推噓總分: +1

作者: hungyastyle - 發表於 2022/03/19 09:16(2年前)

3^F推emptie: 這兩條曲線都是沿著y軸左右對稱的03/19 09:36

4^F→emptie: 如果有2交點那一定是(x,y) (-x,y)的形式03/19 09:36

5^F→emptie: 所以交點的x坐標一定是1/2 , -1/203/19 09:36

[中學] 三角形求角度…不知怎麼畫輔助線

[ Math ]2 留言, 推噓總分: +1

作者: choun - 發表於 2022/03/01 10:40(2年前)

1^F推emptie: https://i.imgur.com/ZD6GjLG.jpg03/01 11:09

[其他] 國中競賽題，求救大神

[ Math ]23 留言, 推噓總分: +8

作者: irishcafee - 發表於 2022/02/27 19:37(2年前)

5^F推emptie: 坐標寫上去是不難解但不曉得有沒有快一點的02/27 20:51

12^F推emptie: https://i.imgur.com/EPnGkrM.jpg02/28 02:49

13^F→emptie: https://www.mathopenref.com/coordpolygonarea.ht02/28 02:49

14^F→emptie: ml02/28 02:49

15^F→emptie: 啊最後一步算錯了答案應該是16/502/28 02:50

16^F推emptie: 啊中間也算錯了重新上傳02/28 02:53

17^F→emptie: https://i.imgur.com/5YJ9TNK.jpg02/28 02:54

18^F推emptie: 答案 17/1002/28 02:56

請教一題複數證明

[ Math ]9 留言, 推噓總分: +3

作者: rfvbgtsport - 發表於 2022/02/17 17:46(2年前)

6^F推emptie: 單位圓上的點取倒數等同對x軸映射（角度相減）如02/18 11:47

7^F→emptie: 果本來的三個點是夾120度角的三個向量，做完這樣的02/18 11:47

8^F→emptie: 映射之後也會是02/18 11:47

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