Question

encontre as raízes das equações do 1 grau
a)6x = 2x + 28
b) 12x-4=10x+3
c)-x-2x-4=11
d)x-2x=81-4x
e) 4.(x+1) = 12
f)x/2-x/4=1/2
g)3.(2x-1) = -2.(x+3)
h)3.(x-2) - 5 . (x-1) = -7
i) x +1/2 = 2/3 - 3x/4

Answer 1

Resposta:

a) 6x = 2x + 28

6x - 2x = 28

4x = 28

x = 28/4

x = 7

b) 12x - 4 = 10x + 3

12x - 10x = 3 + 4

2x = 7

x = 7/2

c) - x - 2x - 4 = 11

- 3x = 11 + 4

3x = - 15

x = - 15/3

x = - 5

d) x - 2x = 81 - 4x

x - 2x + 4x = 81

3x = 81

x = 81/3

x = 27

e) 4 (x + 1) = 12

4x + 4 = 12

4x = 12 - 4

4x = 8

x = 8/4

x = 2

f) x/2 - x/4 = 1/2

2x/4 - x/4 = 1/2

x/4 = 1/2

x = 4 . 1/2

x = 4/2

x = 2

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

6x - 3 = - x + 3

6x + x = + 3 + 3

7x = 6

x = 6/7

h) 3 (x - 2) - 5 (x - 1) = - 7

3x - 6 - 5x + 5 = - 7

3x - 5x = - 7 - 5 + 6

- 2x = - 6

x = 3

i) x + 1/2 = 2/3 - 3x/4

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

12x + 6 = 8 - 9x

12x + 9x = 8 - 6

21x = 2

x = 2/21

Answer 2

Resposta:

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