Răspuns :
-20+(-1):(+2-5)×(-3+7)=
=-20+(-1):(-3)×4=
=-20+1/3×4=
=-20+4/3=
=(-60+4)/3=-56/3=-18,(6)
=-20+(-1):(-3)×4=
=-20+1/3×4=
=-20+4/3=
=(-60+4)/3=-56/3=-18,(6)