Program 1- Solving Simultaneous Linear Equations in 2 unknowns 聯立二元一次方程(53 bytes)

Program 2- Finding the centre and radius of circle in general form and Intersection point(s) of a straight line and circ

Program 3- Cubic Equations in one unknown(130 bytes)

Program 4A- Rotation in Rectangular Coordinate plane 旋轉坐標(23 bytes)

Program 4B- 4 centres 四心坐標 (saved byte ver. with hints)(101 bytes)