2.9×0.45+0.29×4.2+0.029×13的简便方法_数学解答

2.9×0.45+0.29×4.2+0.029×13的简便方法

人气：268 ℃　时间：2019-12-01 13:45:00

解答

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