equation
US
UK equation n: (mathematical expression)
SC 等式 děng shì
TC 等式
TC 等式
SC 方程式 děng shì，fāng chéng shì
TC 方程式
TC 方程式
The professor wrote a difficult equation on the blackboard.
equation n: uncountable (act of equating, equalling)
SC 相等 xiāng děng
TC 相等
TC 相等
SC 均衡 xiāng děng，jūn héng
TC 均衡
TC 均衡
SC 均等 xiāng děng，jūn děng
The difficulty of the project will be another factor in the equation of our expenses.
chemical equation n: (equation: chemical reaction)
SC 化学方程 huà xué fāng chéng
TC 化學方程
TC 化學方程
ordinary differential equation n: (mathematics: OED equation involving function and one variable) (数学)
SC 常微分方程 cháng wēi fēn fāng chéng
partial differential equation n: (mathematics)
SC 微偏分方程式 wēi piān fēn fāng chéng shì
You'd have to be pretty good at math to solve a partial differential equation like this one.