结论所给出的二次有理Bézier曲线的一个整体逼近的几何证明方法，纠正和完善了许伟、齐从谦关于二次有理Bézier曲线的结论。
Conclusion A geometric method was given to prove the whole approximation of rational quadratic curves . The conclusion of rational quadratic B é zier given by XU Wei and QI Cong-qian is made perfect .
许伟