ex. 4 si 5.va rog!urgeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeent!

4. subunitare 1/2 4/5 3/7
supraunitare 3/1 4/2 5/3
echiunitare 1/1 4/4 5/5
5. 2*b + 3*t = 38 b+t = 15
b=15-t => 2*(15-t) + 3*t = 38
=> 30-2t + 3t = 38 =>
=> 30+t =38 => t=8
=> 2b = 38- 3*t =>
=> 2b = 38 - 24 =>
=> 2b = 14 => b = 7