105:3+4-{+4[13+5×(8-5×a)]:4}=28
URGRNT!!!DAU COROANA !!!!


Răspuns :

35+4 - {4[13+5x(8-5xa)]:4=28

39 - {4[13+5x(8-5xa)]:4 =28

4[13+5x(8-5xa)]:4=39-28=11

4[13+5x(8-5xa)]=11x4=44

13+5x(8-5xa)=44:4=11

5x(8-5xa)=11-13

cred ca nu ai copiat correct ex, revino cu ex corect