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

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

人气：234 ℃　时间：2020-06-11 19:48:50

解答

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