NURBS curve equation has three kinds of the equivalence form, i. e. rational fraction, rational base function and homogeneous coordinate.

NURBS曲线方程具有三种等价形式：有理分式表示、有理基函数表示和齐次坐标表示。

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A method for calculation the economic results of the preconcentration using magnetic-pulley separator is recommended and a simple and rational calculation equation is deduced from the method.

本文提出了一种计算磁滑轮预选经济效益的方法，并导出了简单而又合理的计算公式。

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Based on the new method, the paper discusses an inverse mapping of rational parameter surface, also, the implicit equation of the parametric equation is obtained.

用该方法对基于有理参数曲面的逆映射进行了一些探讨，并得到参数曲面的隐式方程。

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The only thing that can alter this losing equation is for rational Republicans to be in a position where they can tell their constituents that they succeeded in moving the country forward while standing up for the values their constituents expect their elected officials to uphold.

FORBES: Must Obama Save The GOP In Order To Save His Agenda And End Dysfunctional Government?

The Black-Scholes equation, brainchild of economists Fischer Black and Myron Scholes, provided a rational way to price a financial contract when it still had time to run.

FORBES: Black-Scholes Didn't Cause the Financial Crash