兩直線互相垂直小貼士
Thomas 介紹一個小貼士，去處理兩條直線互相垂直的題目。
已知兩直線 ##Ax +By = C## 及 ##Dx +Ey = F## 互相垂直，
則 ## AD = -BE##
註: MC 限定，不建議用於試卷一
相關試題
- 2023/II/Q25
分類: 幾何、坐標及三角學
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