解：4个数的和=56.2×4=224.8所以另2个数的和=224.8-102=122.8所以另2个数的平均数=122.8/2=61.4
(56.2X4-102)÷2=61.4
另两个数的和56.2*4-102=122.8另两个数的平均为122.8/2=61.4
