0.56 x 4.5+5.5x0.44=0.56 x 4.5+(4.5+1)x0.44=0.56x4.5+4.5x0.44+0.44=4.5*(0.56+0.44)+0.44=4.5*1+0.44=4.94
0.56x4.5+5.5x0.44=0.56x4.5+0.44x4.5+0.44=（0.56+0.44）x4.5+0.44=4.5+0.44=4.94
