二十点零一二乘以七十五加二千零一乘以零点二五的简便计算

分类: 作业答案 • 2021-12-20 05:27:15

问题描述：

答

20.012*75+2001*0.25
=20.01*75+20.01*25+0.002*75
=20.01*(75+25)+0.15
=2001.15

答

20.012x75+2001x0.25
=20.012x75+20.01x25
=60.036x25+20.01x25
=(60.036+20.01)x25
=80.046x25
=20.0115x(4x25)
=2001.15