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距離與分點座標
Aug 21st 2013, 02:28

因為A,B兩點的y座標都是-2，所以AB線段是一條水平線段

其長度為： (-1) - (-5) = 4

因為 AB線段:PB線段=4:3

所以PB線段長度為 3

再加上 P在AB線段上───也就是說P點的y軸座標亦為 -2

因此P點的x座標為： (-1) - x = 3 → x = (-1) - 3 = -4

故得答案： (-4 , 1 )

p.s.你可以試著把座標圖畫出來，一看就能理解了

參考資料： 我

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