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汉语拼音：fāng chéng

含有未知数的等式，如x+1＝3，x+1＝y+2。也叫方程式。

1. 九章算术之一。

   《后汉书·马严传》“善《九章筭术》” 唐 李贤 注：“ 刘徽 《九章筭术》曰《方田》第一，《粟米》第二，《差分》第三，《少广》第四，《商功》第五，《均输》第六，《盈不足》第七，《方程》第八，《句股》第九。”《九章算术·方程》 白尚恕 注释：“‘方’即方形，‘程’即表达相课的意思，或者是表达式。於某一问题中，如有含若干个相关的数据，将这些相关的数据并肩排列成方形，则称为‘方程’。所谓‘方程’即现今的增广矩阵。”

2. 今指方程式，即含有未知数的等式。如：x－2＝5，x＋8＝y－3。使等式成立的未知数的值称为方程的“解”或“根”。求方程的解的过程称为“解方程”。

• It was like a single equation with two unknowns.

  这挺像两个未知数组成了个简单方程.

• The overwhelming majority of nonlinear differential equations are not soluble analytically.

  绝大多数非线性微分方程是不能用解析方法求解的.

• Another system may be found which is also consistent with the equation.

  也许会发现与这个方程一致的另一系统.

• These are equations of local conservation of mass and the jump condition.

  这些就是局部质量守恒方程和跃变条件.

• The characteristic equations of the two equations are identical.

  两方程对应的特征方程是恒等的.

• A quasilinear equation is one in which the highest - order derivative appears linearly.

  最高阶导数线性地出现的那种方程是准线性方程.

• Determine the solution of this set and correct to two decimal places.

  求此方程的解并精确到两位小数.

• Section 7.2 contains a resume of the fundamental equations.

  第7.2节包括那些基本方程的摘要.

• After each reduction, the remaining equations remain symmetric and banded.

  在每次约化后, 余下的方程是保持对称和带状的.

• Predictors have been constructed by modifying the Crank - Nicolson equation.

  预测式是利用修改克兰克-尼科尔森方程为构成的.

• The schroedinger equation for the one - electron atom is exactly soluble.

  单电子原子的薛定谔方程是可精确求解的.

• Lame - Maxwell equations of equilibrium have important applications in photoelasticity.

  拉密 - 麦克斯韦平衡方程在光测弹性力学中具有重要的作用.

• Even in this case the equations of motion cannot be integrated exactly.

  即使是在这种情况下,运动方程也是不能精确积分的.

• The potential equation had figured in the eighteenth - century work on gravitation.

  位势方程在十八世纪关于引力的研究中已显露头角.

• Thus, enough equations are generated to make the problem determinate.

  于是, 产生了足够的方程使问题为定解.