7.28×0.1+0.5×72.8+0.49×728求简算

分类: 作业答案 • 2023-01-23 10:35:43

问题描述：

答

7.28×0.1+0.5×72.8+0.49×728
=72.8*0.01+0.5*72.8+4.9*72.8
=72.8*（0.01+0.5+4.9）
=72.8*5.41
=393.848

答

7.28×0.1+0.5×72.8+0.49×728
=7.28×﹙0.1＋5＋49﹚
=7.28×54.1
=393.848