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中点问题求差分解法的应用邓丽轩（西北大学附中）在解析几何中，凡涉及二次曲线弦的中点的有关问题，如平行弦中点的轨迹，过定点的弦的中点轨迹，以定点为弦的中点的直线方程等，都可用此法求解．其它有关弦的中点的问题，若用此法探索求解，往往能起到“山穷水尽疑无路...
The application of the difference decomposition method for the mid-point problem Deng Lixuan (Affiliated to Northwest University) In the analytical geometry, all the problems related to the midpoint of the quadratic curve string, such as the trajectory of the midpoint of the parallel string, the midpoint trajectory of the string passing the fixed point, Linear equations that are set to the midpoint of the string can all be solved by this method. Other questions about the midpoint of the string, if you use this method to explore the solution, can often play a "difficulties...