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八年级数学：矩形ABCD折叠，当△EFC是直角三角形时，求BE的长？
八年级数学：矩形ABCD折叠，当△EFC是直角三角形时，求BE的长？
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248/254
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八年级数学：矩形ABCD折叠，当△EFC是直角三角形时，求BE的长？
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