Question

1°)Resolva as seguintes equações, sendo U=Q

A)3x -9 = 0
B)x - 5 = -7
C)x - 6 = 5x + 8
D)10x = 20 + 9x
E)2x + 5 = x + 5 - 3x
F)2x + 6 = x
G)2x + 1 = 15
H)5 - x - 20 = 5x - 10
I)x + 6 = 2 - 3x
J)10x = 40
K)x = 15 - 2
L)6 (x + 3) - 2 (x - 5) = 20
M)-2x - 18 = 15

Answer 1

Resposta / Explicação passo-a-passo:

A)

3x - 9 = 0

3x = 9

x = 9 / 3

x = 3

B)

x - 5 = - 7

x = - 7 + 5

x = - 2

C)

x - 6 = 5x + 8

- 6 - 8 = - x + 5x

- 14 = 4x

4x = - 14

x = - 14 / 4

x = - 3,5

D)

10x = 20 + 9x

10x - 9x = 20

x = 20

E)

2x + 5 = x + 5 - 3x

5 - 5 = x - 2x - 3x

0 = x - 2x - 3x

0 = x - 5x

0 = - 4x

x = 0 / - 4

x = 0

F)

2x + 6 = x

2x - x = - 6

x = - 6

G)

2x + 1 = 15

2x = 15 - 1

2x = 14

x = 14 / 2

x = 7

H)

5 - x - 20 = 5x - 10

5 - 20 + 10 = x + 5x

- 15 + 10 = x + 5x

- 5 = x + 5x

6x = - 5

x = - 5 / 6

I )

x + 6 = 2 - 3x

x + 3x = 2 - 6

4x = 2 - 6

4x = - 4

x = - 4 / 4

x = - 1

J)

10x = 40

x = 40 / 10

x = 4

K)

x = 15 - 2

x = 13

L)

6 . ( x + 3 ) - 2 . ( x - 5 ) = 20

6x + 18 - 2x + 10 = 20

6x - 2x = 20 - 18 - 10

4x = 2 - 10

4x = - 8

x = - 8 / 4

x = - 2

M)

- 2x - 18 = 15

- 15 - 18 = 2x

- 33 = 2x

x = - 33 / 2

x = - 16,5

Espero ter ajudado ;)