作者查詢 / Starvilo
作者 Starvilo 在 PTT 全部看板的留言(推文), 共2557則
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2F推: 題目不是問x>0?10/18 18:21
1F推: 算幾x=3^(1/3)10/18 18:14
2F推: https://i.imgur.com/X2MpFEc.jpg10/18 18:19
1F推: 萬能k法,最小值18/25,求得x=-1810/17 22:09
2F推: 再用tan(a+b)即可10/17 22:13
3F推: min(18/25)^.5才對10/17 22:34
4F推: https://i.imgur.com/J5uwOqX.jpg10/17 22:44
5F推: Tb帶錯 囧 !tb=1/5 帶入求ta=7/1710/17 22:46
11F推: 更正分解144=8*18, 18/25<=k”<=810/18 09:43
1F推: (x+5) + 169/(x+5)把負號提出,算幾~10/18 06:44
1F推: Max(2pi/a,2pi/b)10/14 17:28
1F推: https://i.imgur.com/BeTH5Xk.jpg10/13 23:04
2F推: 令t=x+1/x>=2化簡 =3t=6?10/13 20:30
1F推: 國中補助線可得30,高中三角sin(x)/sin(160度-x)*10/07 17:13
2F→: sin(80度)/sin(40度)=110/07 17:13
3F→: 也可得x=30度10/07 17:13
4F推: 國小沒 https://i.imgur.com/2uitioT.jpg10/07 21:38
6F推: AE=DE=~很多邊相等(且ADE正三角)10/07 22:29
7F→: BED等腰10/07 22:30
5F推: [(n+1)^0.5 -n^0.5)=<1/(2n^0.5)<[n^0.5 -(n-1)^009/30 08:10
6F→: .5] 累加 對消即可09/30 08:10
7F推: [(n+1)^0.5 -n^0.5)=1/[n+1)^0.5+n^0.5];n^0.5 -(09/30 08:16
8F→: n-1)^0.5=1/[n^0.5+(n-1)^0.5]其實就有理化夾擠對09/30 08:16
9F→: 消09/30 08:16
10F→: 等於誤打09/30 08:17
11F推: 最後再+1~09/30 08:20
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