1.28x0.36+3.22x0.64简便计算

分类: 作业答案 • 2021-12-03 16:09:09

问题描述：

答

1.28x0.36+3.22x0.64
＝0.64x2x0.36+3.22x0.64
=0.64x(0.72+3.22)
=0.64x3.94
=0.64x(4-0.06)
=0.64x4+0.64x0.06
=2.56+0.0384
=2.5984