1)(-7)-(-2)+(-6)=
=
=
2)(+5)-(+9)+(+17)=
=
=
3)(+5)+(-8)-(+12)+(-23)=
=
=
4)(+1.6)+(-2.1)-(3.1)-(-19)=
=
=
5)(-2又3分之2)+(4又3分之1)-(+6又2分之1)-(-2分之3)=
=
=
6)(0.2)-(+4又10分之3)+(+2.7)+(-6又5分之3)=
=
=
7)(-5)-[(-2)+(+8)]-(-14)=
=
=
8)(+2.4)-[(-5.8)+(-6.4)]=
=
=