2.5*1.25*6.4巧算

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/09 11:34:26
2.5*1.25*6.4巧算

2.5*1.25*6.4巧算
2.5*1.25*6.4巧算

2.5*1.25*6.4巧算
将6.4拆成8乘以0.8,则1.25乘8得10,2.5*0.8得2

2.5*1.25*6.4
=10/4*10/8*8*8/10
=80/4
=20

=2.5*2.5*0.5*4*4*0.4=(2.5*4)*(2.5*4)*(0.5*0.4)=10*10*0.2=20

2.5*1.25*6.4
=2.5*1.25*(4*8*0.2)
=2.5*4*1.25*8*0.2
=10*10*0.2
=20

2.5*1.25*6.4
=2.5*4*1.25*8*0.2
=10*10*0.2
=20