Question

por favor me ajudem
f) 4/5 + x/2 = x/3 - 1
g) x + 3 = 2 ( x- 1/2)
h) 3(x-4)/9 - 1 = x- 4- x/6​

Answer 1

Oie, Td Bom?!

f)

4/5 + x/2 = x/3 - 1

30(4/5 + x/2) = 30(x/3 - 1)

30 . 4/5 + 30 . x/2 = 30 . x/3 - 30

6 . 4 + 15x = 10x - 30

24 + 15x = 10x - 30

15x - 10x = - 30 - 24

5x = - 54

x = - 54/5

g)

x + 3 = 2(x - 1/2)

x + 3 = 2x - 2 . 1/2

x + 3 = 2x - 1

x - 2x = - 1 - 3

- x = - 4 . (- 1)

x = 4

h)

[3(x - 4)]/9 - 1 = x - 4 - x/6

[3x - 3 . 4]/9 - 1 = x - 4 - x/6

[3x - 12]/9 - 1 = x - 4 - x/6

18([3x - 12]/9 - 1) = 18(x - 4 - x/6)

18 . [3x - 12]/9 - 18 = 18x - 18 . 4 - 18 . x/6

2(3x - 12) - 18 = 18x - 72 - 3x

6x - 24 - 18 = 15x - 72

6x - 42 = 15x - 72

6x - 15x = - 72 + 42

- 9x = - 30

x = -30/-9

x = 30/9

x = [30 ÷ 3]/[9 ÷ 3]

x = 10/3

Att. Makaveli1996