“设而不求”是解析几何中重要的解题策略,在许多问题中都可以见到它的身影.“设而不求”在解决相交弦问题、定值与定点问题、方程问题、参数范围问题、最值问题、存在性问题等问题时十分有用.其常见情形是,所给问题中出现了两个点,这两点可能是直线与圆锥曲线的交点,可能是圆锥曲线与圆锥 “Set without seeking ” is an important problem solving strategy in analytic geometry, and it can be seen in many problems. “Set without asking ” In solving the problem of intersecting strings, setting value and fixed point, Equation problems, parameter range problems, most value problems, existential problems, etc. The common situation is that there are two points in the given problem, which may be the intersection of the straight line and the conic curve, which may be the cone Curves and cones