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作者 wxtab019 在 PTT [ Math ] 看板的留言(推文), 共281則
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[幾何] 請教大大正五邊形?
[ Math ]2 留言, 推噓總分: +1
作者: rfvbgtsport - 發表於 2013/08/08 17:59(10年前)
1Fwxtab019:會求第2個正5邊形的邊長嗎?找出來之後找規律比例縮小08/08 18:21
[中學] 國中幾何
[ Math ]20 留言, 推噓總分: +2
作者: superstars - 發表於 2013/08/03 23:53(10年前)
13Fwxtab019:我想到了 的確是畫那條輔助線 1小題應該是為了幫助08/04 16:47
14Fwxtab019:知道ABED四邊形是圓内接四邊形 利用對角相加180度08/04 16:48
15Fwxtab019:再SAS全等 所以知道線AD=線EC 再來就(ry08/04 16:49
16Fwxtab019: 線AD=線DE08/04 16:49
[其他] 向量-叉積-符號表示方式
[ Math ]15 留言, 推噓總分: +3
作者: peterchen119 - 發表於 2013/08/02 21:41(10年前)
1Fwxtab019:通常會加箭頭代表向量 不同的話..勤勞和懶惰的差別?08/02 22:50
2Fwxtab019:i j k 也只是一個代號 並不是i j k 就能表示向量08/02 22:51
3Fwxtab019:另外 X Y這種向量 正常也是要箭頭08/02 23:01
4Fwxtab019:不過有些書沒辦法打出箭頭 所以可能會用粗體等等代表08/02 23:02
5Fwxtab019:i j k 這種也是 向量有時候會用粗體代表 不一定箭頭08/02 23:03
7Fwxtab019:不過其實題目那樣 看起來會像是坐標而已不是向量08/03 21:18
11Fwxtab019:除了^ 有的書好像是印﹋08/03 22:13