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

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[中學] 高中多項式&判別式一題

[ Math ]8 留言, 推噓總分: +3

作者: ww235666qq - 發表於 2021/10/29 14:26(2年前)

1^F推emptie: 1錯誤，兩相同實根也有可能是x=110/29 15:54

2^F→emptie: 2正確，條件有排除x=1是ax^2+bx+c=0的解10/29 15:54

3^F→emptie: 3正確10/29 15:54

4^F→emptie: 4錯誤，例外也是三個根都是x=1的情況10/29 15:54

5^F→emptie: 5正確10/29 15:54

[中學] 高中數學競賽題(一題)

[ Math ]3 留言, 推噓總分: +1

作者: adamchi - 發表於 2021/10/25 22:32(2年前)

2^F推emptie: https://i.imgur.com/FpNYu7z.png10/25 23:45

3^F→emptie: 其中一種10/25 23:46

[機統] 魷魚遊第五關的通關人數期望值怎麼算

[ Math ]9 留言, 推噓總分: +5

作者: ntpuisbest - 發表於 2021/10/22 00:28(2年前)

1^F推emptie: 1塊玻璃 19.5人。2塊玻璃 19人。 18塊：20-9=11人10/22 01:35

2^F→emptie: 我應該沒理解錯題意吧10/22 01:35

[幾何] 三角形內切圓證明

[ Math ]7 留言, 推噓總分: +1

作者: goodwang - 發表於 2021/10/04 23:11(2年前)

7^F推emptie: 關鍵字：旁心10/05 14:39

[中學] 一題國二面積問題

[ Math ]10 留言, 推噓總分: +5

作者: whz567 - 發表於 2021/09/21 11:08(2年前)

1^F推emptie: https://i.imgur.com/2Oaafva.jpg09/21 12:53

2^F→emptie: 延伸BC與 GD交於H09/21 12:53

3^F→emptie: AEFG 面積= AEHD 面積 = ABCD面積09/21 12:54

[代數] 高中

[ Math ]15 留言, 推噓總分: +2

作者: QQLeopard - 發表於 2021/08/02 16:07(2年前)

1^F推emptie: a-b =108/02 17:23

2^F→emptie: sqrt(a)-sqrt(b)<0.108/02 17:23

3^F→emptie: sqrt(b+1)-sqrt(b) <0.108/02 17:23

4^F→emptie: 移項平方展開08/02 17:23

5^F→emptie: b+1<b+0.01+0.2sqrt(b)08/02 17:23

6^F→emptie: sqrt(b)>4.95 , b>24.502508/02 17:23

7^F推emptie: 第一題08/02 18:16

8^F→emptie: α = δ ，β = γ08/02 18:16

9^F→emptie: 圖形對稱於x=708/02 18:16

10^F→emptie: f(x) = a(x-7)^2-1308/02 18:16

11^F→emptie: f(3) = 16a-1308/02 18:16

12^F→emptie: f(5) = 4a-1308/02 18:16

13^F→emptie: 16a-13 與 4a-13 之中點亦為 708/02 18:16

14^F→emptie: 解得 a= 2，f(x) =2x^2 -28a +8508/02 18:16

[其他] 參數式的問題......

[ Math ]15 留言, 推噓總分: +5

作者: harry921129 - 發表於 2021/07/22 16:28(2年前)

2^F推emptie: Y+Z= 1+t07/22 17:09

3^F→emptie: 更正，y+z=t07/22 17:10

5^F→emptie: 如果存在y0 為整數，t也會是整數07/22 17:11

6^F→emptie: y0 z0 為整數07/22 17:11

[中學] 一題國二角度問題

[ Math ]47 留言, 推噓總分: +8

作者: whz567 - 發表於 2021/07/18 21:11(2年前)

38^F推emptie: 太厲害了。我一開始以為要利用AD=CE的條件，所以往07/20 10:04

39^F→emptie: AC外面做正三角形，但其實AE=BD才是題目暗示的07/20 10:04

Re: [中學] 取球數期望值

[ Math ]21 留言, 推噓總分: +6

作者: arrenwu - 發表於 2021/07/17 13:55(2年前)

2^F推emptie: 這個偷渡防不勝防07/17 15:59

[中學] 有關組合數學的問題

[ Math ]15 留言, 推噓總分: +3

作者: hau - 發表於 2021/07/17 08:19(2年前)

3^F推emptie: https://math.stackexchange.com/q/9609307/17 13:35

4^F→emptie: 類似的題目07/17 13:35

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