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异面直线间距的计算，是立体几何教学中的一个难点。为了突破难点，根据《考试说明》的规定：“对于异面直线的距离，只要求会计算已给出公垂线时的距离。”笔者就此总结了如下几种常用方法，供参考。一、直接法1、定义法。根据定义，结合条件直接找出公垂线，在相应的平面内求
The calculation of the distance between different straight lines is a difficult point in the teaching of solid geometry. In order to break through the difficulties, according to the “Exam Description” stipulates: “For distances on different lines, we only need to calculate the distance when the public vertical line has been given.” The author summarizes the following common methods for reference. First, the direct method 1, the definition method. According to the definition, the combination of conditions directly finds the vertical line and seeks in the corresponding plane.