实现班级成绩管理，及解方程组，和做动画的功能。-Implementation class performance management and solution of equations, and do a movie feature.

计算四元线性方程组的解，利用线性代数的有关知识，但很简单……仅利用解为D/D0计算-Computing elements linear equations, linear algebra knowledge, but is simple ... ... calculated using only solution to D/D0