1、系统函数:y=(x-p)(x-q)/(p-q)+f. 2、分解公式:(x1-p)(x2-q)=(q-p)f. 3、弦方程:(y-y1)/(x-x1)=(y2-y1)/(x2-x1)=(x1-p)/(p-q)-f/(x1-p), → (y-2f)(x1-p)-(x1-p)2=[(x1-p)2/(p-q)-f](x-p). 4、偏导方程: (p-q)(y-2f)=2(x1-p)(x-q). (对“弦方程”取x1偏导数) 5、李氏线: (p-q)(y-2f)2+4f(x-p)(x-q)=0,(还可用“微差法”求之) → 4(x-p/2-q/2)2/(p-q)2+(y-2f)2/[(p-q)f]=1.(椭圆、双曲线) |
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