意思是：三次方程；
句子实例：
Descartes's solution of a depressed quarto equation employs the method of undetermined coefficients.
笛卡儿的分解四次方程的解法采用待定系数。
This procedure is used to calculate a quadratic equation of one dollar cottage roots, very useful, and they hope to help you.
这个程序是用来计算一个一元二次方程的平房根的，非常有用，希望对你有帮助。
