题目内容
The average number of p,q,r is 4,and average number of p,q,r,x is﹣2,then x =________.
(英文词典:average number平均数)
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题目内容
The average number of p,q,r is 4,and average number of p,q,r,x is﹣2,then x =________.
(英文词典:average number平均数)