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数学7上：若AC=3，CP=1，怎么求PN的长？线段的中点，基础计算题
数学7上：若AC=3，CP=1，怎么求PN的长？线段的中点，基础计算题
七年级数学，直线和射线，线段计算，角度计算，期末考试题21/113
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