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数学八年级：矩形折叠问题，两次利用勾股定理，辅助线做法需牢记
数学八年级：矩形折叠问题，两次利用勾股定理，辅助线做法需牢记
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125/254
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