(-1.5)+1.75+(-7.3)+(+2.25)+(+8.5)
(-1.5)+1.75+(-7.3)+(+2.25)+(+8.5)
(-1.5)+1.75+(-7.3)+(+2.25)+(+8.5)
(-1.5)+1.75+(-7.3)+(+2.25)+(+8.5)
1.75+2.25+8.5-(1.5+7.3)
=12.5-8.8=3.7
3.7
3.7
3.7小朋友这些基础要好好学的
(-1.5)+1.75+(-7.3)+(+2.25)+(+8.5)
=-1.5+1.75-7.3+2.25+8.5
=1.75+2.25+8.5-1.5-7.3
=12.5-1.5-7.3
=3.7