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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] 質數多or完全平方數多

[ Math ]9 留言, 推噓總分: +3

作者: buffalobill - 發表於 2022/07/01 12:20(1年前)

1^F推emptie: 對一個足夠大的N來說質數的密度會趨近 N/ln(N)07/01 12:43

3^F→emptie: 說錯了應該說質數的數量07/01 12:45

Re: [中學] abc的可能範圍

[ Math ]2 留言, 推噓總分: +2

作者: Vulpix - 發表於 2022/05/19 03:54(2年前)

1^F推emptie: 謝謝05/19 08:32

[幾何] 請問一個立體圖形

[ Math ]23 留言, 推噓總分: +8

作者: llww - 發表於 2022/05/17 22:48(2年前)

6^F推emptie: 誒不就是圓錐嗎05/18 01:22

10^F→emptie: 啊我搞錯同方向所有截面的意思了05/18 01:25

15^F推emptie: https://www.geogebra.org/m/GJKt2WMh05/18 13:00

[中學] 高中排列組合（多點取不相交線段情形）

[ Math ]2 留言, 推噓總分: +1

作者: bigching - 發表於 2022/05/11 21:56(2年前)

1^F推emptie: 用「中央的點連接哪個點」分成7類討論05/11 22:19

2^F→emptie: 剩下少到可以窮舉了而且有一定的對稱性05/11 22:19

Re: 請教一題實數

[ Math ]6 留言, 推噓總分: +2

作者: Honor1984 - 發表於 2022/05/10 17:43(2年前)

3^F推emptie: 感覺用算幾不等式也可以證明05/10 18:40

4^F→emptie: 啊我搞錯了不需要05/10 18:43

5^F→emptie: 四個數都小於等於1/4S 但加起來又要等於一個S05/10 18:43

[中學] 排列組合

[ Math ]6 留言, 推噓總分: +3

作者: susiseptem - 發表於 2022/05/09 20:40(2年前)

3^F推emptie: 7!/(3!*4!)-4!/(2!*2!) * 3!/(2!*1!)05/09 21:11

4^F推emptie: 把捷徑想成4個→跟3個↑的含相同物排列05/09 21:27

5^F→emptie: 每個獨特的排列都對應一條路徑05/09 21:28

[中學] 一題排組

[ Math ]2 留言, 推噓總分: +1

作者: hungyastyle - 發表於 2022/05/09 18:10(2年前)

1^F推emptie: 你下面計算錯誤了是120不是24005/09 18:25

Re: [機統] sin(x) 的期望值

[ Math ]10 留言, 推噓總分: 0

作者: nyu5765 - 發表於 2022/05/08 05:15(2年前)

8^F推emptie: wayne201105/08 22:24

[幾何] 請問一題國中幾何

[ Math ]18 留言, 推噓總分: +5

作者: jenshi - 發表於 2022/05/06 12:10(2年前)

3^F推emptie: 只要以三角形的內心為圓心，取一個比內切圓半徑大05/06 15:24

4^F→emptie: 的數值作為半徑畫圓，都可以滿足DE=FG=HI，圓半徑=05/06 15:24

5^F→emptie: 5應該是要拿來湊出某個我們看過會算的三角形邊長組05/06 15:24

6^F→emptie: 合？但我想不出來要怎麼湊05/06 15:24

[微積]請問一題旋轉體體積

[ Math ]5 留言, 推噓總分: +1

作者: DrMeredith - 發表於 2022/05/03 20:50(2年前)

2^F推emptie: 直接積分。你有算出pi^2那項應該說明你的想法沒問05/03 21:31

3^F→emptie: 題，剩下的可能是計算上的錯誤？05/03 21:31

4^F→emptie: 你是不是展開的時候漏寫了根號那項的平方05/03 21:32

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