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[数学] 猴哥112难题第49题。If the average(arithmetic mean) of x, y, z, 5, and 7 is? |
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猴哥112难题第49题。If the average(arithmetic mean) of x, y, z, 5, and 7 is?
https://bbs.gter.net/thread-1770127-1-1.html
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