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数学7上：线段AB=3，点D为BC的中点，AD=1，求线段BC和AC的长？
数学7上：线段AB=3，点D为BC的中点，AD=1，求线段AC和BC的长？
七年级数学，直线和射线，线段计算，角度计算，期末考试题37/113
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