4.5*5.4+0.45+45+4.5用简便计算

分类: 作业答案 • 2022-01-04 12:40:25

问题描述：

答

4.5*5.4+0.45+45+4.5
=4.5*(5.4+0.1+10+1)
=4.5*16.5
=4.5*(4.5+12)
=4.5*4.5+54
=20.25+54
=74.25