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初中数学：矩形动点问题怎么求t值？找出对应线段代数式联立方程
初中数学：矩形边上的动点问题怎么求t值？化动为静，找出对应线段代数式，联立方程解出方程即可。
八年级数学：平行四边形，矩形，菱形，正方形，三角形中位线培优127/254
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