作者查詢 / cuteSquirrel
作者 cuteSquirrel 在 PTT [ Math ] 看板的留言(推文), 共318則
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6F推: 1/2 * 鄰邊長 * 鄰邊長 * sin夾角03/29 11:43
7F→: 兩個三角形,底相同,共享同樣的高。03/29 11:44
10F推: 向量旋轉後 邊長不變。03/29 13:02
2F推: 推 幾何 讚03/28 23:21
2F→: : )03/24 19:59
1F推: 簡潔清晰03/24 12:41
27F→: 並且讓投影後的三角形躺在xy平面上03/23 23:21
22F推: 就是邊BB’和邊CC’03/23 23:17
24F→: 就算這時候x還不知道,也可以從根號內部的式子知道03/23 23:18
25F→: 這兩個,其中一個長,一個短。03/23 23:19
26F→: 對,我為了好算,把A移到原點。03/23 23:20
1F推: 根號{13}03/23 19:02
2F→: 假設原本的正三角邊長為x03/23 19:02
3F→: 用投影+輔助線得到的直角三角形 用畢氏定理解x03/23 19:03
5F推: 已經很接近你考卷畫的樣子了03/23 19:20
6F推: 根號{ x^2 - 4 } = 邊BB'03/23 19:23
7F→: 根號{ x^4 - 9 } = 邊CC'03/23 19:23
8F→: 根號{ x^2 - 9 } = 邊CC' (訂正次方數)03/23 19:26
9F→: 根號{ x^2 - 12 } = 下底 - 上底 = 邊BB' - 邊CC'03/23 19:27
10F→: 解x03/23 19:27
12F→: 順序和原本一樣 B投影到B' C投影到C'03/23 20:20
13F→: 為了方便好想和計算方便 可以投影後的三角形躺在03/23 20:21
14F→: xy平面上03/23 20:21
15F→: ^讓03/23 20:21
17F→: 畫圖和計算的過程中自然會發現一個長 一個短03/23 20:27
18F→: 原本題目數據算是有配好03/23 20:27
20F→: 對03/23 22:59
1F推: 漂亮 大推 用到奇偶函數的對稱性質03/21 18:53
1F推: 您po的原文敘述有強調是平滑曲線,排除斷點 折角03/21 18:46
2F→: "not have any breaks, corners or cusps."03/21 18:47
2F推: 羊羊好帥03/21 12:07
14F推: 讚 用向量解好漂亮03/19 16:08
1F推: 看他的型態 好像有機會用柯西不等式03/18 20:00