Răspuns:
7+13=20
20·(-5)=-100
-100:(-20)=5
5-10=-5
_________
-121+13=-108
-108·(-5)=540
540:(-20)=-27
-27-10=-37
____________
11+13=24
24·(-5)=-120
-120:(-200=6
6-10=-4
