4.8×2.4+2.1×1.3的脱式计算能简算的简算

分类: 作业答案 • 2021-12-19 11:37:23

问题描述：

答

4.8×2.4+2.1×1.3
=（5-0.2）×2.4+（2+0.1）×1.3
=5×2.4-0.2×2.4+2×1.3+0.1×1.3
=12-0.48+2.6+0.13
=14.6-0.35
=14.25