Question

VAMOS RESOLVER AS EQUAÇÕES ABAIXO: a) 4x – 2 = 9 b) 10x + 3 = 7x c) -3x – 2 = - 6x d) 4x + x = 80 e) 5x – 2x = 210 f) 6x – 2x = 36 + 3x g) 2( x – 2 ) + 3 ( 2x +2 ) = -5 ( 2- x ) h) x + 3( x – 1 ) – 2 – 3 (x – 3 ) = 0 i) 4 ( x – 2 ) – 2 ( x + 1 ) = 4

Answer 1

Resposta:

Explicação passo a passo:

a) 4x - 2 = 9
4x = 9 + 2
4x = 11
x = 11/4

b) 10x + 3 = 7x
10x - 7x = - 3
3x = -3
x = -3/3
x = -1

c) - 3x - 2 = -6x
- 3x + 6x = 2
3x = 2
x = 2/3

d) 4x + x = 80
5x = 80
x = 80/5
x = 20

e) 5x - 2x = 210
3x = 210
x = 210/3
x = 70

f) 6x - 2x = 36 + 3x
6x - 2x - 3x = 36
x = 36

g) 2*(x - 2) + 3*(2x + 2) = - 5*(2 - x)
2x - 4 + 6x + 6 = - 10 + 5x
8x + 2 = - 10 + 5x
8x - 5x = - 10 - 2
3x = - 12
x = - 12/3
x = - 4

h) x + 3*(x - 1) - 2 - 3*(x - 3) = 0
x + 3x - 3 - 2 - 3x + 9 = 0
7x + 4 = 0
7x = - 4
x = -4/7

i) 4*(x - 2) - 2*(x + 1) = 4
4x - 8 - 2x - 2 = 4
2x - 10 = 4
2x = 4 + 10
2x = 14
x = 14/2
x = 7