4.1x0.8-0.2直接运算最简便。4.1x0.8-0.2=3.28-0.2=3.08
4.1x0.8-0.2=(4+0.1)x0.8-0.2=4x0.8+0.1x0.8-0.2=3.2+0.08-0.2=3.28-0.2=3.08
4.1x0.8-0.2=3.28-0.2=3.08谢谢，请采纳
