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数学7上：45°32´×5+(48°27´19〞+68°47´23〞)，角度计算？
数学7上：45°32´×5+(48°27´19〞+68°47´23〞)，怎么混合运算？
七年级数学，直线和射线，线段计算，角度计算，期末考试题60/113
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