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圆锥曲线中的定值问题是指某些几何量不受点的运动变化影响而有固定取值的一类问题,高考要求会证明与曲线上动点有关的定值问题(几何量与参数无关),从以下几个方面研究定值问题:圆锥曲线的定义中蕴含的定值;曲线方程中蕴含的定值;曲线上的动点中蕴含的定值;动直线的交点在定曲线上。
The problem of fixed value in conic curve is a kind of problem that some geometric quantities are not affected by the change of point but have fixed value. The requirement of college entrance examination will prove the fixed value problem related to the point on the curve (the geometric quantity is independent of the parameter ), The problem of valuation is studied in the following aspects: the fixed value contained in the definition of conic curve; the fixed value contained in the curve equation; the fixed value contained in the moving point on the curve; the intersection point of the moving straight line is on the fixed curve.