działania na liczbach wymiernych 13 -(-15) - (-15)*(-12)= 16 /(-20)-4/(-2)= 9/(-3)-(-15)/(-3)= -18/(-3)-21/3= /to podzielic

13 -(-15) - (-15)*(-12)=-152 16 /(-20)-4/(-2)=1.2 9/(-3)-(-15)/(-3)=-8 -18/(-3)-21/3= -1

13-(-15)-(-15)*(-12)=-152 16/(-20)-4/(-2)=2,8 9/(-3)-(-15)/(-3)=-8 -18/(-3)-21/3=-1

13+15-180=28-180=-152 16/-20-40/-20=24/20=1,2 24/-3=-24/3=-8 -39/3=-13