👤

-(-7-9-20)+(-3+11-21)=

Răspuns :

7+9+20-3+11-21 =
16+17-10 =
33 - 10 = 23
-(-7-9-20)+(-3+11-21)=
(7+9+20) + ( -3+11-21)=
36+(-25+11)=
34+(-14)=
=20