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题目 若平面上A、B两点到直线a的距离分别为m、n(m>n),则线段AB的中点O到a的距离为_____. 分析:此题应分为两种情况,如图1.
If the distance between the two points A and B on the plane to the line a is m and n (m>n) respectively, then the distance from the midpoint O to a of the line AB is _____. Analysis: This question should be divided into two cases ,Figure 1.