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圓錐曲線公式p的意義
圓錐曲線公式p的意義
更新时间:2025-04-03 16:07:00

  1、參數p的幾何意義,是抛物線的焦點F(p/2,0)到準線x=-p/2的距離,稱為抛物線的焦參數。

  2、橢圓∶焦半徑∶a+ex(左焦點),a-ex(右焦點),x=a2/c。

  3、雙曲線∶焦半徑∶|a+ex|(左焦點)|a-ex|(右焦點),準線x=a2/c。

  4、抛物線(y2=2px)∶焦半徑∶x+p/2準線∶x=-p/2。

  弦長=√k2+1*√(x1+x2)2-4x1x2以上是焦點在x軸的,y軸隻需将x換成y即可。

  5、抛物線

  y2=2px(p>0)過焦點的直線交它于A(X1,Y1),B(X2,Y2)兩點。

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