作者查詢 / ntnusliver
作者 ntnusliver 在 PTT [ Math ] 看板的留言(推文), 共122則
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2F→: a,b,c是三角形的邊長 是實數 所以會有多一些性質12/18 18:59
3F→: (a-b)^2 +(b-c)^2 +(c-a)^2 =0 在實數時 a=b=c12/18 19:00
1F推: 三邊比5:3:6 先算cosA07/31 22:08
3F推: 不用吧...你會積圓的面積 就會積橢圓面積05/07 23:01
4F→: 還可以用投影證明 兩平面夾(西塔) 投影後面積05/07 23:02
5F→: 成|cos西塔|倍05/07 23:02
1F推: 最後 a(2a^2-9b)=-54 知a是3的倍數 令a=3k12/04 23:23
2F→: 可再化簡 k(2k^2-b)=-212/04 23:23
3F推: 我得到答案是(-3,0) (6,9)(-6,7)12/04 23:26
4F→: 原PO負號有筆誤 還有要檢查d^2 >012/04 23:27
5F→: 所以會少一組12/04 23:27
6F→: 化成k(2k^2-b)=-2 好處是k只有±1,±2 四種情形12/04 23:29
8F推: (2a^2-9b) 和3互質 且a(2a^2-9b)=-54 =>a是3的倍數12/04 23:40
9F→: 抱歉 上面是指 若a不是3的倍數 2a^2-9b會和3互質12/04 23:41
10F→: 即可推得a是3的倍數12/04 23:42
5F推:第一 令座標A(0,0)B(-4,-1)C(-1,-3) 用矩形04/26 14:19
6F→:切掉外面三角形04/26 14:19
1F推:發散的級數 不能交換加的次序 類似的數列有一大堆03/24 21:19
5F推:X=a + 1/a 證明 a^n + 1/(a^n) 可表示為X的多項式03/26 11:06
5F推:分子是 a^12+2a^6+103/19 21:52
6F推:題目給的是 a+(a^-1)=-303/19 21:56
5F推:想請教 第一個用這方法證明平方和公式的數學家是???03/05 19:21
6F→:很多網站都寫了這方法 但似乎都沒有出處03/05 19:22
7F→:不像高斯的故事那麼有名03/05 19:22
12F推:謝謝~03/06 07:26
1F推:左右平移的第一組數字寫錯了~ 用根與系數真是太神了02/09 18:43