2 3/4+0.25-(-7 1/2)+(-2 1/4)-1.5-2.75 怎么解啊····················

问题描述:

2 3/4+0.25-(-7 1/2)+(-2 1/4)-1.5-2.75 怎么解啊····················

2 又3/4+0.25-(-7又 1/2)+(-2 又1/4)-1.5-2.75
=(2又 3/4-2.75)+(7又 1/2-1.5)+(0.25-2又 1/4)
=0+6-2
=4