把AB两列复制到新表,用高级筛选--筛选不重复的记录.再把筛选结果复制到另一个新表AB列,然后在这个表的C2输入=SUMPRODUCT((SHEET1!A1:A500=A2)*(SHEET1!B1:B500=B2),SHEET1!C1:C500)并向下填充.(注:SHEET1假设为原数据表的表名)
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