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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] 請教一題相似形的題目

[ Math ]7 留言, 推噓總分: +2

作者: math365 - 發表於 2021/05/10 19:48(3年前)

1^F推emptie: AMB DMN 相似，DAN BPA 相似 AM:MN = AB:DN05/10 19:56

2^F→emptie: = AP:AN05/10 19:57

3^F→emptie: x:2 = x+8 : x+205/10 19:58

4^F→emptie: *DNM05/10 19:59

5^F→emptie: **NMD05/10 19:59

[中學] 排列組合求檢查

[ Math ]9 留言, 推噓總分: +3

作者: lionleo228 - 發表於 2021/05/05 10:29(3年前)

1^F推emptie: 沒錯吧是加法加錯了05/05 10:49

[機統] 一題機率問題

[ Math ]4 留言, 推噓總分: +2

作者: td2100106 - 發表於 2021/04/24 16:24(3年前)

1^F推emptie: 扣掉5場全平手的就行了…吧？04/24 17:17

2^F→emptie: 1-(1-p-q)^504/24 17:17

[機統] 骰子機率

[ Math ]3 留言, 推噓總分: +3

作者: simmond - 發表於 2021/04/21 18:10(3年前)

2^F推emptie: 最後那題少一個/2，取2個點數各兩顆是沒順序的04/21 23:37

[中學] 請教ㄧ題國中數學

[ Math ]1 留言, 推噓總分: +1

作者: math365 - 發表於 2021/04/20 17:26(3年前)

1^F推emptie: 6，8，1004/20 18:15

[機統] 高一機率問題

[ Math ]4 留言, 推噓總分: +1

作者: deardidi - 發表於 2021/04/20 12:57(3年前)

1^F推emptie: 你這樣抽只有有三種情況04/20 13:08

2^F→emptie: A比較大，B比較大，相等04/20 13:08

3^F→emptie: 所以1-1/5-7/10就是了04/20 13:08

[代數] 一個不等式證明

[ Math ]12 留言, 推噓總分: +6

作者: NASAlion - 發表於 2021/04/11 08:44(3年前)

7^F推emptie: 改成三維的情況就可以兩兩夾60度了04/11 12:10

8^F→emptie: 這樣就能湊出來了04/11 12:11

[中學] 其中恰有一組a(i)>a(i+1)

[ Math ]36 留言, 推噓總分: +9

作者: TOMOHISA - 發表於 2021/04/07 20:46(3年前)

3^F推emptie: 補充樓上說的，不符的就是最後兩群湊起來會等於(104/07 22:21

4^F→emptie: ,2,3...,n) 的那些，共有n+1種04/07 22:21

[中學] 請教一題算面積

[ Math ]3 留言, 推噓總分: +1

作者: Romulus - 發表於 2021/03/29 22:59(3年前)

2^F推emptie: 沒有要解開吧？用xy表示即可03/30 00:20

[中學] 請教一題高中極限問題

[ Math ]10 留言, 推噓總分: +1

作者: yizihappyQ - 發表於 2021/03/29 16:13(3年前)

1^F→emptie: r的絕對值比7大的話這個分子會長得比分母快很多，03/29 16:44

2^F→emptie: 不可能會收斂03/29 16:44

3^F→emptie: 比7小的話就反過來，會變成003/29 16:45

4^F→emptie: 1-r^n的項是可以被1-r整除的03/29 16:46

5^F→emptie: 會變成(r^n-1 + r^n-2 + r^n-3 +...+1)03/29 16:47

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