50.4x1.9-1.9的简便运算怎么做?

分类: 作业答案 • 2022-01-09 18:01:09

问题描述：

答

50.4x1.9-1.9
=(50.4-1)*1.9
=(50-0.6)*(2-0.1)
=50*2+0.6*0.1-50*0.1-2*0.6
=100+0.06-5-1.2
=94.94