Question

a) x/4 - 1 = 2 + x/10 b) x/2 + 4x = 15 - ( - x - 6 ) c) x/2 + x/4 = x+6/2 Quem me responder ganha 50 pontos !!!!

Answer 1

Oie, Td Bom?!

a)

x/4 - 1 = 2 + x/10

20(x/4 - 1) = 20(2 + x/10)

20 . x/4 - 20 = 20 . 2 + 20 . x/10

5x - 20 = 40 + 2x

5x - 2x = 40 + 20

3x = 60

x = 60/3

x = 20

b)

x/2 + 4x = 15 - (- x - 6)

x/2 + 4x = 15 + x + 6

x/2 + 4x = 21 + x

2(x/2 + 4x) = 2(21 + x)

2 . x/2 + 2 . 4x = 2 . 21 + 2x

x + 8x = 42 + 2x

9x = 42 + 2x

9x - 2x = 42

7x = 42

x = 42/7

x = 6

c)

x/2 + x/4 = [x + 6]/2

4(x/2 + x/4) = 4 . [x + 6]/2

4 . x/2 + 4 . x/4 = 2(x + 6)

2x + x = 2(x + 6)

3x = 2x + 12

3x - 2x = 12

x = 12

Att. Makaveli1996