作者查詢 / Starvilo
作者 Starvilo 在 PTT [ Math ] 看板的留言(推文), 共757則
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16F推: 中點性質聯想~平行 成比例、直角斜邊3點等距05/04 15:22
6F推: 3腳合力等於0(橫向縱向)?04/03 20:56
7F推: 原式平方整理:16cos^3x -4cos^2x -16cosx+8 求導04/01 23:29
8F→: 即可04/01 23:29
1F推: F=GMm/r^2 = mv*2/r 如果v*=v/cos30 符合答案03/09 10:04
17F推: https://i.imgur.com/W9spu2k.jpg https://i.im02/03 08:22
18F→: gur.com/PQw5zKu.jpg02/03 08:22
19F推: 最後面為*<*02/03 09:04
20F→: 1/2(1*sqr2)sinc <1/2(1*sqr2)02/03 09:06
21F推: https://i.imgur.com/zXX8xYr.jpg02/03 09:10
2F推: https://i.imgur.com/0VnbtwQ.jpg12/30 11:25
10F推: Cosxcos(60-x)cos(60+x)=1/4cos3x12/23 21:44
12F推: 積化和差~12/24 19:43
1F推: 構造一組(1 3 4 7 11 16 18 19)差2+1+3+4+5+2+1=1811/08 15:26
2F→: a7-a2=1511/08 15:26
4F推: 沒511/08 17:26
5F→: 了解到1~5累加可包含1~1511/08 17:27
3F推: (a+b+(a^2+b^2)^0.5)>=(a+b)(1+1/2^0.5)檢查等號條10/24 18:56
4F→: 件且3/a+1/b=1 ,a=b=4剛好滿足條件?10/24 18:56
5F推: 我再想想~10/24 19:12
6F→: 因為a+b未必最小10/24 19:14
7F推: 科西三角可解,但答案很醜!10/24 20:08
9F推: https://i.imgur.com/qcAyIyW.jpg https://i.im10/24 20:51
10F→: gur.com/h78Y9M0.jpg10/24 20:51
11F推: https://i.imgur.com/5ZhGuet.jpg10/24 20:52
12F→: 難算== 不過應該是考旁切圓10/24 20:53
16F推: 因為直角三角形周長等於旁切圓半徑2倍,(3,1)只10/24 21:39
17F→: 可能在切點或圓外,在圓外的距離一定大於在切點的10/24 21:39
18F→: 距離,所以r越小周長越小(斜線大於圓心到切點距離10/24 21:39
19F→: )10/24 21:39
25F推: 假設切點A,d(O,P)>=d(O,A)=r ,顯然P=A r最小10/25 07:07
26F推: https://i.imgur.com/rqffNCq.jpg10/25 07:37
27F推: 對同一點p可以很多r,但如何使r最小,可發現在切點10/25 07:43
28F→: 最小10/25 07:43
29F→: 同一直線才對10/25 07:44
30F推: 旁切圓是跟三邊都是切10/25 07:46
31F推: 上面同一直線寫錯==,原本是對的,簡單來說可以透10/25 08:11
32F→: 過距離不等式求r range ,Rmin發生再切點10/25 08:11
1F推: 令解的為k,(k+(x+1))(k-(x+1))=144=72*2=~10/20 19:14
2F→: 易得2x+2=70 x=34,其他比照10/20 19:15