-0.5-(-13/4)+2.75-(+15/2)

问题描述:

-0.5-(-13/4)+2.75-(+15/2)

-0.5-(-13/4)+2.75-(+15/2)
=-0.5+3.25+2.75-7.5
=(3.25+2.75)-(0.5+7.5)
=6-8
=-2