=(0.16+0.3)+(45-5.7）
=0.46+39.3
=39.76
希望能够帮到你，谢谢采纳！
0.16+（45.3-5.7）=0.16+45.3-5.3-0.4=40+0.16-0.4=39.76
首先45.3-5.7结果是39.6然后39.6+0.16=39.76
0.16+（45.3-5.7）=0.16+45.3－5.7=45.46－5.7=40.49－0.7=39.79
