(-0.5)-(-2又4分之1)+3.07-(15又2分之1)=?

问题描述:

(-0.5)-(-2又4分之1)+3.07-(15又2分之1)=?

原式=-0.5+2.25+3.07-15.5
=-0.5-15.5+2.25+3.07
=-16+5.32
=-10.68