helpppppppp....
.......
![Helpppppppp class=](https://ro-static.z-dn.net/files/d08/366027a38d40b8d2ca4cb79b5be3e629.jpg)
Explicație pas cu pas:
a) -7+(-3) ;
b) 15+(-25) ;
c) (-1)+(-2)+(-3)+(-4) ;