Question

1) Resolva as equações (U = Q):
a) 5(x + 12) = x

b) 4(x – 1) = 2(x – 4)

c) 2x = 5(x + 3)

d) 5(1 – x) – 2x + 1= - 3(2 + x)

e) 3(0,6 + x) + 0,6(1 + x) = 6

Answer 1

Explicação passo-a-passo:

a) 5(x + 12) = x

5x + 60 = x

5x - x = - 60

4x = - 60

x = - 60/4

x = 15

b) 4(x – 1) = 2(x – 4)

4x - 4 = 2x - 8

4x - 2x = - 8 + 4

2x = - 2

x = - 2/2

x = - 1

c) 2x = 5(x + 3)

2x = 5x + 15

2x - 5x = 15

- 3x = 15

3x = 15

x = 15/3

x = 5

d) 5(1 – x) – 2x + 1= - 3(2 + x)

5 - 5x - 2x + 1 = -6 - x

- 7x + 6 = - 6 - x

- 7x + x = - 6 - 6

- 6x = - 12

6x = 12

x = 12/6

x = 2

e) 3(0,6 + x) + 0,6(1 + x) = 6

1,8 + 3x + 0,6 + 0,6x = 6

2,4 + 3,6x = 6

3,6x = 6 - 2,4

3,6x = 3,6

x = 3,6/3,6

x = 1