Salut.
Exercitiul 5:
a + b = 27
a = 4/5 × b = 4b/5
4b/5 + b = 27 /×5
4b + 5b = 27 × 5
b × (4 + 5) = 135
9b = 135
b = 135 ÷ 9
[tex]\boxed{b=15}[/tex]
a = 27 - 15
[tex]\boxed{a=12}[/tex]
Exercitiul 6:
a + b + c + d = 54
b = a + 1, c = b + 1 = a + 2, d = c + 1 = a + 3
a + a + 1 + a + 2 + a + 3 = 54
4a + 6 = 54
4a = 54 - 6
4a = 48
a = 48 ÷ 4
[tex]\boxed{a=12}[/tex]
- Lumberjack25
