Y²=2pxY=2py0(x-p/2)/y0²-p²怎样联立这两条方程得到Y=-p²/y0呢
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![Y²=2pxY=2py0(x-p/2)/y0²-p²怎样联立这两条方程得到Y=-p²/y0呢](/uploads/image/z/6104681-17-1.jpg?t=Y%26%23178%3B%EF%BC%9D2pxY%EF%BC%9D2py0%28x-p%2F2%29%2Fy0%26%23178%3B-p%26%23178%3B%E6%80%8E%E6%A0%B7%E8%81%94%E7%AB%8B%E8%BF%99%E4%B8%A4%E6%9D%A1%E6%96%B9%E7%A8%8B%E5%BE%97%E5%88%B0Y%EF%BC%9D-p%26%23178%3B%2Fy0%E5%91%A2)
Y²=2pxY=2py0(x-p/2)/y0²-p²怎样联立这两条方程得到Y=-p²/y0呢
Y²=2px
Y=2py0(x-p/2)/y0²-p²怎样联立这两条方程得到Y=-p²/y0呢
Y²=2pxY=2py0(x-p/2)/y0²-p²怎样联立这两条方程得到Y=-p²/y0呢
y=2py0(x-p/2)/(y0^2-p^2)
=y0*(2px-p^2)/(y0^2-p^2)
=y0*(y^2-p^2)/(y0^2-p^2),
——》y*(y0^2-p^2)=y0*(y^2-p^2),
——》y0*y^2-(y0^2-p^2)y-y0*p^2=(y0*y+p^2)(y-y0)=0,
——》y-y0=0,即y=y0,
或y0*y+p^2=0,即y=-p^2/y0.