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求解有关梯形的几何证明题或计算题时，常常需要添加辅助线，将梯形问题转化为三角形或其他特殊四边形问题，从而使问题巧妙地获解（证）．乎移法即是一种非常有效的方法，将梯形中的有关线段平行移动到适当位置，能够使某些几何量巧妙地联系起来，从而迅速打通解题思路．现举
When solving a geometrically proven or calculated problem involving a trapezoid, it is often necessary to add an auxiliary line to transform the trapezoidal problem into a triangle or other special quadrilateral problem so that the problem is subtly solved (proof). Nearly moving is a very effective method. Move the relevant line segment in the trapezoid parallel to the appropriate position, which can make certain geometric quantities connect ingeniously and quickly solve the problem. Now