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作者 walkwall 在 PTT [ Math ] 看板的留言(推文), 共500則

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[幾何] 1/4圓內接正方形面積

[ Math ]4 留言, 推噓總分: +1

作者: DingLey - 發表於 2022/10/01 23:45(1年前)

4^F→walkwall: 隱含需要是內接最大正方形就看題目有沒有說這假設10/02 00:31

[中學] 一題數學

[ Math ]32 留言, 推噓總分: +4

作者: sluggard - 發表於 2022/09/27 04:19(1年前)

1^F推walkwall: 問題性質思路感覺跟生日問題很像可以參考wiki看看09/27 04:44

[中學] 一題數列規律的問題

[ Math ]11 留言, 推噓總分: +5

作者: deardidi - 發表於 2022/09/21 11:30(1年前)

1^F推walkwall: 這數列正中間不就 K^2 嗎? 然後有K組配對總和變K^309/21 11:58

2^F→walkwall: 所以答案就 16^2=25609/21 11:58

10^F推walkwall: XDD 沒注意到頭尾大概是本來想出8改成16沒改好09/21 15:05

[線代] 矩陣特徵值

[ Math ]26 留言, 推噓總分: +9

作者: RicciCurvatu - 發表於 2022/09/16 15:45(1年前)

16^F推walkwall: 那有沒有可能三維也有反例?09/17 11:38

[機統] 摸彩卷不重複中獎的選號方法

[ Math ]25 留言, 推噓總分: +7

作者: xxxx9659 - 發表於 2022/08/25 18:00(1年前)

20^F推walkwall: 有關你想要的解是不是有點類似科克曼女生問題08/26 20:46

21^F→walkwall: 那就變成其實已經先事先編好組讓參與者只能抽號08/26 20:47

22^F推walkwall: 其實只要抽號的過程公平類似畫鬼腳也沒什麼問題08/26 20:53

23^F→walkwall: 等抽完再公布哪些獎由那些號獲得08/26 20:53

[中學] 求最小值

[ Math ]9 留言, 推噓總分: +3

作者: DrMeredith - 發表於 2021/12/23 00:40(2年前)

3^F推walkwall: 既然這樣也可以看成(a,0,0)(0,b,0)(0,0,c)三角形12/23 06:16

4^F→walkwall: 的周長固定一邊可以看出剩下兩邊等長時有最小12/23 06:17

5^F→walkwall: 所以說最小值應該是平均時沒錯難在證明12/23 06:18

6^F→walkwall: 阿...仔細想過後一樓的方法確實更直覺12/23 06:22

[中學] 請教一題國中競賽題目

[ Math ]14 留言, 推噓總分: +5

作者: billykkk - 發表於 2021/12/07 08:04(2年前)

11^F推walkwall: 形式看起來很像海龍公式12/07 18:55

[其他] 判斷是否partition

[ Math ]7 留言, 推噓總分: +4

作者: andylinag - 發表於 2021/12/01 16:03(2年前)

1^F推walkwall: 1應該是反證法, 假定存在兩個Ab1Ab2相交,但b1不等b212/01 17:58

2^F→walkwall: 推得b1必等於b2,矛盾得證 2的話就證明for all平面12/01 17:59

3^F→walkwall: 上的點都存在一個b使得Ab通過該點12/01 18:00

[其他] 價格與數量變化對新增份額佔比

[ Math ]22 留言, 推噓總分: +2

作者: Tesngray - 發表於 2021/09/14 22:38(2年前)

1^F推walkwall: 你這是想用線性的答案去回答一個非線性的問題09/14 23:17

3^F→walkwall: 如果只是單純想解決問題那就把乘積取log 這樣就09/14 23:24

4^F→walkwall: 能用線性的方式計算貢獻度了09/14 23:25

[微積] 請問函數為何不能一對多

[ Math ]26 留言, 推噓總分: +4

作者: rebe212296 - 發表於 2021/09/06 15:54(2年前)

1^F推walkwall: 定義是一層層往上的如果函數沒這定義光是連續不09/06 16:16

2^F→walkwall: 連續就無法定義後面可微什麼的都不用說了09/06 16:16

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