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作者 reye 在 PTT [ Math ] 看板的留言(推文), 共158則
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3F推: 好解法09/25 18:51
1F推: 式子有點小錯,是t^2-k^2才對。不過這方法夠直覺夠09/10 00:23
2F→: 簡單09/10 00:23
3F推: 歐拉04/09 01:33
2F推: 漂亮的作法!04/07 23:52
7F推: 答案27吧?01/11 13:13
2F推: 算是很初等的解法了,但對小學生還是太難了04/17 10:58
14F推: 這題可以用國中方法做04/14 20:40
15F→: D往AB做垂線,得DCB為一等腰三角形04/14 20:41
16F推: 令垂足為E,三角形ADE中使用畢氏定理04/14 20:45
17F→: E為BC中點04/14 20:45
18F推: DE長度可由三角形ODE用畢氏定理得04/14 20:48
25F→: 第一題答案是給57.5,厲害!03/23 22:15
8F推: 水面的法向量和圓錐的軸垂直的時候是雙曲線12/16 06:25
2F推: 需要上方蓋子的半徑09/21 21:11
3F推: 雨水一定是先打到椅子跟地面切齊處09/21 21:13
4F→: 椅子的高度有意義嗎?09/21 21:14