作者查詢 / Starvilo
作者 Starvilo 在 PTT [ Math ] 看板的留言(推文), 共760則
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4F推: 直觀有一解x=y=z=909/26 12:27
5F推: 若9^x>=x^9(微積),原式:9^x+9^y+9^z>=3^(x+y)+~09/26 16:21
6F→: sigma(3^x-3^y)^2>=0 考慮等式成立x=y=z09/26 16:22
7F→: 參考看看~09/26 16:22
8F推: X在於(0~9)(9~00)需討論09/26 16:33
9F推: (0~9)反向09/26 16:36
10F→: (9~00)正向09/26 16:37
11F推: 還是怪怪的XD09/26 16:48
15F推: 我問高手他說鈍角直角銳角都可 囧!09/26 19:29
18F推: 那配方不是就解決了?09/26 19:53
4F推: 萬能K法,判別式06/17 16:32
7F推: 每7個數只有1個7的倍數,但每差1位就差7的因數06/13 17:18
8F推: 當我上面沒說,也許高冪次有!06/13 18:04
9F推: 相鄰的想法 參考看看06/14 18:36
10F→: https://i.imgur.com/z33HjPZ.jpg06/14 18:37
11F推: 補充(n-r1)x~x(n-r2+1)有d項06/14 18:43
12F推: 所以(n-r1)/7=r1+1=> n=8r1+7 得證06/14 18:52
14F推: 至少有7個因數的個數06/14 21:21
15F→: 7的06/14 21:22
16F推: 簡單的說分子的7次方大於等於分母的7次方,但分子06/14 21:31
17F→: 的7次方要如何取?考慮每連續7數必有一數7的倍數,06/14 21:31
18F→: 以此類推連續49就有49倍數06/14 21:31
22F推: D為分母小於等於分子?06/14 22:11
25F推: 連續乘就因為分子連續數剛好是d個,這d個至少可提06/14 22:30
26F→: 出幾個7,就除7的幂次06/14 22:30
27F推: 分子個數(n-r1)-(n-r2+1)+1=r2-r1=d06/14 22:38
29F推: r2 r1先天條件兩不相等06/14 22:44
30F→: r2-r1>=106/14 22:44
32F推: 題目兩係數相等 組合選取錯要不同啊~一個r1一個r06/14 22:47
33F→: 206/14 22:47
34F→: 錯改數06/14 22:47
36F推: 我再思考應該不用加1 ,1<=d<=d/6 右邊矛盾,所以06/15 00:35
37F→: 只有1可能。06/15 00:35
38F推: 我在重新研究一下!XD06/15 08:04
39F推: 配合數的幂次06/15 08:05
1F推: 不用那麼麻煩PB延伸至AC即可06/10 16:31
1F推: https://i.imgur.com/YXcVtPX.jpg06/06 23:14
6F推: 我再想想,應該不難06/06 23:45
9F推: 推~06/07 15:23
2F推: 孟氏04/06 21:37
3F推: 不確定04/06 21:42
4F推: 沒錯XD04/06 21:47
1F推: 13^2/204/02 23:23
2F→: 對角線^2=(9+3)^2+5^2=13^204/02 23:24
5F推: 9延伸3公分,連C成矩形,畢氏定理。04/02 23:33