autolisp编写的解决一元线性方程的程序，用了3种方法。-autolisp prepared solve a linear equation procedures used three methods.

可以进行输电线路的状态方程式求解 并求得最大弧垂-Transmission line can solve the equation of state and find the maximum sag

一元二次方程求解，可以求解实根与虚根等多种情况下的解。-quadratic equation with one unknown solution, you can solve the real root and virtual root and other situations of the solution.