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作者 Vulpix 在 PTT [ Math ] 看板的留言(推文), 共7235則
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1F推: 這個θ不是極坐標的那個角度。請當成一般參數算。06/30 00:25
3F→: 對β微分哪。06/30 00:18
13F推: 類似這個吧:06/28 14:02
14F→: 我想的例子不行,當我沒說XD06/28 14:03
1F→: a=1就不對了啊。06/27 20:45
6F推: 根本是平行四邊行吧。06/26 19:05
7F→: 形06/26 19:05
13F推: 仔細想想,這根本是菱形啊。06/26 22:43
24F推: 不,必然是菱形。因為梯形的EF是兩底的調和平均,06/27 08:15
25F→: 但現在又剛好是兩底的算術平均,所以兩底相等。06/27 08:15
26F→: 因此四邊形ABCD是一個兩對角線互相垂直的平行四邊形06/27 08:16
27F→: ,那就是菱形。06/27 08:18
33F→: 過O平行底邊的那一段就是調和平均啊。不過題目確實06/27 09:35
34F→: 沒說E.O.F三點共線,我自己腦補了。(不過沒說的這06/27 09:37
35F→: 麼多……而且他自己畫的圖又很像共線。)06/27 09:37
7F→: 5.6.題目出錯。06/27 09:33
10F推: 原來是以前ODE常看到的logistic!那時候最不懂的就06/22 21:37
11F→: 是為什麼這東西有名字XD06/22 21:37
6F→: 從頭到尾柯西不等式。06/18 08:51
1F→: 中學?那就先猜 AB=BA 啊。然後 k=6。06/16 23:57