75×21+25×37用简便算法怎末算

分类: 作业答案 • 2023-01-09 23:24:22

问题描述：

75×21+25×37用简便算法怎末算

答

75×21+25×37
=(100-25)×21+25×37
=100×21+25×21+25×37
=100×21+(37-21)×25
=2100+16×25
=2100+4×4×25
=2100+4×100
=2100+400
=2500