12.515+12.557简便计算

分类: 作业答案 • 2021-12-16 22:29:15

问题描述：

12.5*15+12.5*57简便计算

答

12.5*15+12.5*57
=12.5*(15+57)
=12.5*72
=12.5*(80-8)
=12.5 *80-12.5*8
=1000-100
=900

12.5*15+12.5*57简便计算