3.61*0.75+0.61*3/4+(-0.2)*0.75
问题描述：
3.61*0.75+0.61*3/4+(-0.2)*0.75
答
3.61*0.75+0.61*3/4+(-0.2)*0.75
=3.61*0.75+0.61*0.75+(-0.2)*0.75
=(3.61+0.61-0.2)*0.75
=4.02*0.75
=3.015