14×6-（7+13+20+9+15）=84-64=20
答：X是20
7,13,20,9,X,15这几个数的平均数是14,则X是?
7,13,20,9,X,15这几个数的平均数是14,则X是?
数学人气：754 ℃时间：2020-03-20 10:50:43
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