用简便方法计算下面各题：（1）2.9×0.45++0.29×4.2+0.029×13 (2)3.84×9.6+0.96×61.6_数学解答

用简便方法计算下面各题：（1）2.9×0.45++0.29×4.2+0.029×13 (2)3.84×9.6+0.96×61.6

人气：471 ℃　时间：2019-09-01 10:51:07

解答

（1）2.9×0.45+0.29×4.2+0.029×13 =2.9×0.45+2.9×0.42+2.9×0.13=2.9×(0.45+0.42+0.13)=2.9×1=2.9(2)3.84×9.6+0.96×61.6=3.84×9.6+6.16×9.6=(3.84+6.16)×9.6=10×9.6=96