Question

EFETUE AS EXPRESSÕES A SEGUIR

a)6x+2(x-1)=14

b)4x-2(x-5) =10

c) 3(x - 2) + 5 = 5

d) -3x - 3(x - 3) = 3

e) 3x + 4(x + 2) = 2(x + 9)

f) 2(x - 6) + 7x = 5 - 3(x - 2)​

COM CÁLCULO PFVR​

Answer 1

Resposta:

a)6x+2(x-1)=14

$6x + 2x - 2 = 14 \\ 8x - 2 - 14 = 0 \\ 8x - 16 = 0 \\ 8x = 16 \div (8) \\ x = 2$

b)4x-2(x-5) =10

$4x - 2x + 10 = 10 \\ 2x + 10 - 10 = 0 \\ 2x = 0 \\ x = 0$

c) 3(x - 2) + 5 = 5

$3x - 6 + 5 = 5 \\ 3x - 1 - 5 = 0 \\ 3x - 6 = 0 \\ 3x = 6 \div (3) \\ x = 2$

d) -3x - 3(x - 3) = 3

$- 3x - 3x + 9 = 3 \\ - 6x + 9 - 3 = 0 \\ - 6x + 6 = 0 \\ - 6x = - 6 \times ( - 1) \\ 6x = 6 \div (6) \\ x = 1$

e) 3x + 4(x + 2) = 2(x + 9)

$3x + 4x + 8 = 2x + 18 \\ 7x + 8 - 2x - 18 = 0 \\ 5x - 10 = 0 \\ 5x = 10 \div (5) \\ x = 2$

f) 2(x - 6) + 7x = 5 - 3(x - 2)

$2x - 12 + 7x = 5 - 3x + 6 \\ 9x - 12 - 5 + 3x - 6 = 0 \\ 12x - 23 = 0 \\ 12x = 23 \\ \\ x = \frac{23}{12}$