軌跡d數唔識
回答 (2)
2012-12-23 8:16 pm
✔ 最佳答案
設P(x,y)﹐因為PM^2 + PN^2 = 40(x - 3)^2 + (y - 1)^2 + (x - 9)^2 + (y - 6)^2 = 40
x^2 - 6x + 9 + y^2 - 2y + 1 + x^2 - 18x + 81 + y^2 - 12y + 36 = 40
2x^2 + 2y^2 - 24x - 14y + 87 = 0
此即為P點的軌跡方程
2012-12-23 8:56 pm
收錄日期: 2021-04-13 19:12:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121223000051KK00081