(-0.5)-(-3又4分之1)+2.75-(+7又2分之1)

问题描述:

(-0.5)-(-3又4分之1)+2.75-(+7又2分之1)

-2

(-0.5)-(-3又4分之1)+2.75-(+7又2分之1)=(-0.5)-(-3.25)+2.75+7.5=13