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关注:1
2013-05-23 12:21
求翻译:Seven numbers are lined up and their average is 30. The average of the first three numbers is 28 and the average of the last five numbers is 33. What's the third number?是什么意思?![]() ![]() Seven numbers are lined up and their average is 30. The average of the first three numbers is 28 and the average of the last five numbers is 33. What's the third number?
问题补充: |
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