2.9×0.45+0.29×4.2+0.029×13的简便方法

分类: 作业答案 • 2022-04-12 10:36:43

问题描述：

答

2.9×0.45+0.29×4.2+0.029×13
=2.9x0.45+2.9x0.42+2.9x0.13
=2.9x(0.45+0.42+0.13)
=2.9x1
=2.9