说明：  一个不错的解方程软件，可以直接输入参数解一元一次方程，一元二次方程，二元一次方程，三元一次方程，不完全一元三次方程，在设计工作中遇到需要频繁解方程时，可以减少不少工作量^_^
(Solve the equation of a good software solution can be directly input parameters in One equation, a quadratic equation, an equation of binary, ternary one equation, incomplete cubic equation, in the design of the frequently encountered in solving equations, you can reduce the number of work ^ _ ^)