Va rog dau Corana!!!​

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

5.x;y=nr căutate

x+y=27

x=4/5 din y=4/5*y

x=4y/5

4y/5+y/1=27/1

Aducem la același numitor.

4y+5y=135

9y=135

y=135/9

y=15

x=4*15/5=60/5=12

6. a+b+c+d=54

b=a+1

c=a+2

d=a+3

a+a+1+a+2+a+3=54

4a+6=54

4a=54-6

4a=48

a=48/4

a=12