A+B+C+D=4 × 9/16=9/4
A+B+C= 3 × 3/9=1
D=9/4 - 1=5/4
A.B.C三个数的平均数是3/9,A.B.C.D四个数的平均数是9/16,求D.
A.B.C三个数的平均数是3/9,A.B.C.D四个数的平均数是9/16,求D.
数学人气：705 ℃时间：2019-09-11 10:39:56
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