降维、降幂是解数学问题的常规思路 ,它可将复杂问题转化为简单问题 ,将不熟悉的问题转化为熟悉问题处理 .而有些问题则可以通过升维、升幂将原来问题置于新的环境中 ,在新的视角下 ,用新的方法简单获解 .下面例子就是将两条相交直线升幂 ,用二次曲线求中点、求弦长的办法来解? Dimensionality reduction and power reduction are conventional ideas for solving mathematics problems. They can turn complex problems into simple ones, turning unfamiliar issues into familiar ones, and some problems can be solved by raising dimensions or raising powers. In the new environment, under a new perspective, the new method is used to easily solve. The following example is to solve the problem by using two intersecting lines to increase the power, using the quadratic curve to find the midpoint and finding the length of the string.