Question

Qual a resposta dessas perguntas ?

Answer 1

Resposta:

2)

a)

3(x + 2) = 15

3x + 6 = 15

3x = 15 - 6

3x = 9

$x = \frac{9}{3} \\ \\ x = 3$

b)

5(x - 1) = 30

5x - 5 = 30

5x = 30 + 5

5x = 35

$x = \frac{35}{5} \\ \\ x = 7$

c)

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

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

$x = \dfrac{29}{2}$

d)

3(x - 1) - 2(x - 3) = 10

3x - 3 - 2x + 6 = 10

x + 3 = 10

x = 10 - 3

x = 7

e)

2(3x - 5) - x = 10 - 3x

6x - 10 - x = 10 - 3x

5x - 3x = 10 + 10

2x = 20

$x = \frac{20}{2} \\ \\ x = 10$

f)

$\frac{x}{2} - \frac{x}{4} = \frac{1}{2} \\ \\ \frac{2x - x = 2}{4} \\ \\ 2x - x = 2 \\ \\ x = 2$

g)

$\frac{x}{2} - \frac{x}{4} = 5 \\ \\ \frac{2x - x = 4 \times 5}{4} \\ \\ 2x - x = 4 \times 5 \\ \\ x = 20$

Bons Estudos!