-2.125+3又5分之一-(-5又8分之3)-(+3.2)
=-2.125+3.2+5.375-3.2
=3.25
-3分之2-(-1又4分之3)-(-1又3分之2)+(-1.75)
=-3分之2+1.75+1又3分之2-1.75
=1