2.6*9.98简便计算

分类: 作业答案 • 2021-12-31 12:40:14

问题描述：

2.6*9.98简便计算
还有0.032*2.5*1.25

答

2.6×9.98
=2.6×（10-0.02）
=2.6×10-2.6×0.02
=26-0.052
=25.948
0.032×2.5×1.25
=（0.4×2.5）×（0.08×1.25）
=1×0.1
=0.1