在对椭圆、双曲线的研究中 ,笔者发现一组有趣性质 .为便于结论统一 ,我们先引入一个概念 :定义　在二次曲线方程Ａｘ2 +Ｂｙ2 +Ｃ=0 (其中Ａ、Ｂ、Ｃ是常数且Ａ·Ｂ·Ｃ≠ 0 )中 ,称比值 - ＡＢ 为此二次曲线的斜心率 ,记为Ｋ ,即Ｋ =- ＡＢ.例如圆ｘ2 +ｙ2 =ｒ2 的斜心率Ｋ = In the study of ellipses and hyperbolas, the author found a set of interesting properties. To facilitate the conclusion of unification, we first introduce a concept: defined in the quadratic curve equation Ax2 +By2 +C = 0 (where A, B, C are constants And in A·B·C≠ 0 ), the ratio -AB is the oblique heart rate of this quadratic curve, denoted as K, that is K =- AB. For example, the oblique heart rate of circle x2 +y2 =r2 is K =