Question

4 - Calcule o valor das expressões:
a) 10-1 + 8 - 4+8x = 0
b) 12-8 +9-3 - 6x = 3
c) 25-1-4-7 = 4x-8x
d) 45 -18 +3 +1 -2 =9x - 2x
e) 25 - 10x + 7 - 4x​

Answer 1

Resposta:

A) 10 - 1 + 8 - 4 + 8x = 0

8x = 0 -10 + 1 - 8 + 4

8x = - 21

x = - 21/8

x = - 2,625...

B) 12 - 8 + 9 - 3 - 6x = 3

- 6x = 3 - 12 + 8 - 9 + 3

- 6x = - 7 (- 1)

6x = 7

x = 7/6

x = 1.166...

C) 25 - 1 - 4 - 7 = 4x - 8x

8x - 4x = - 13

4x = - 13

x = - 13/4

x = - 3,25

D) 45 - 18 + 3 + 1 - 2 = 9x - 2x

29 = 7x

x = 29/7

x = 4,142...

E) 25 - 10x + 7 - 4x = 0

- 14x = - 28 (- 1)

14x = 28

x = 28/14

x = 2