3.8 X 4.56 + 3.83 X 5.44 = 3.8 X 4.56 + (3.8 + 0.03) X 5.44 = 3.8 X 4.56 + 3.8 X 5.44 + 0.03 X 5.44 = 3.8 X (4.56 + 5.44) + 0.3 X 0.544 = 3.8 X 10 + 0.1632 = 38.1632
应该是这样:3.8 X 4.56 + 3.83 X 5.44 = 3.8 X 4.56 + (3.8 + 0.03) X 5.44 = 3.8 X 4.56 + 3.8 X 5.44 + 0.03 X 5.44 = 3.8 X (4.56 + 5.44) + 0.3 X 0.544 = 3.8 X 10 + 0.1632 = 38.1632