在样条曲线中拔出断点 fnrfn
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
二次曲线中点弦存在性问题的探讨，对二次曲线的研究有着及其重要的意义。
Problems about the existence of midpoint chord of quadratic curve is worthy of discussing in the study of the theories about quadratic curve.
用间接观测平差法分析线性回归方程，用曲线中点比较法选择最优非线性回归方程。
Linear regression equation is analyzed by using indirect error-smoothing, and nonlinear regression equation is optimally selected by using the method of comparison of mid-point of curve.
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