2a=8 a=4 k=3/4=b/a a=4 b=3 双曲线方程x^2/16-y^2/9=1
p(x0,y0) PM: y-y0=3/4(x-x0)
OM: y=-3/4x M([4y0-3x0]/6,[4y0-3x0]/8)
原点到直线PM的距离d=|4y0-3x0|/5
|PM|= 写不下
2a=8 a=4 k=3/4=b/a a=4 b=3 双曲线方程x^2/16-y^2/9=1
p(x0,y0) PM: y-y0=3/4(x-x0)
OM: y=-3/4x M([4y0-3x0]/6,[4y0-3x0]/8)
原点到直线PM的距离d=|4y0-3x0|/5
|PM|= 写不下