3000-101×21=?84×0.25+4分之1×16=?

分类: 作业答案 • 2021-12-29 16:26:39

问题描述：

答

3000-101×21
=3000-(100+1)×21
=3000-100×21-1×21
=900-21
=879
84×0.25+4分之1×16
=84×0.25+0.25×16
=（84+16）×0.25
=25