Пошаговое об1. -8-b+a+23=15-b+a
-8-b-(a+23)=-8-b-a-23=-a-b-31
2. 13+m+(-4-n)=13+m-4-n=9+m-n
13+m-(-4-n)=13+m+4+n=17+n+m
3. 37-26+42+(15+26-42)=37-26+42+15+26-42=52
37-26+42-(15+26-42)=37-26+42-15-26+42=80ъяснение:
