作者查詢 / silvermare
作者 silvermare 在 PTT [ Math ] 看板的留言(推文), 共101則
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1F→: 你確定題目是 AB//EG ? 圖中的藍線跟黃線的意義是?06/17 22:19
6F推: 1個玻璃死人的期望值是0.5,18個的死人期望值是910/22 13:01
2F推: 當AB=AC,P是BC上一點,畢氏可證AP^2=AB^2-BP*PC12/17 12:29
3F→: 交弦定理可得AP*PD=BP*PC12/17 12:30
4F→: 合併二式及可求AP12/17 12:31
2F推: 是ln|x|的函數圖形04/27 01:24
3F推: 算g'(x)的公式,然後算g'在0的極限,跟g'(0)比對04/22 00:41
4F→: g'(0)要用微分的定義算04/22 00:42
1F→: 2. 1-1/2+1/3-1/4... 看泰勒級數04/17 16:01
2F→: 1. 看一下題目有沒有打錯 cos(t^3) 很奇怪04/17 16:01
3F推: 以下只考慮n>=2,令f(x)=(1+x)^n-nx-1,算1,2次微分04/16 17:21
4F→: x>-1時,f"(x)>0,所以f'遞增,f'在x=0由負轉正,04/16 17:24
5F→: 所以f只有在x=0是局部極小,也是絕對極小04/16 17:25
6F推: 而f(0)=004/16 17:27
2F→: If f(x)=-f(-x), then F(x,1/2) is not well-define04/15 23:47
5F推: In fact, F(x,s) ~ F(x,r), for any s,r in [0,1]04/16 17:13
1F→: sinX=X 應該是唯一解 X=0吧04/05 00:29