Question

preciso das equações armadas!!!

a) 3 . (3 + x) = 5 . (x + 2)

b) 2 . (3 + x) = 10

c) 5 . (2 - x) = 5

d) 6 . (x + 1) = 24

e) - 9 . (x - 4) = 9

f) 4 . (x + 2) = -10

g) 3 . (3 + x) = 5 . (x + 2)

h) 2 . (x - 2) = 3 . (7 + 2x)

i) 5 . (8 - 4x) = 2 . (6x + 4)

j) 4 . (3x + 6) = 3 . (7 + 5x)

k) 2 . (5 - 2x) = 4 . (3 - 2x)

l) 3 . (x + 6) = 5 . ( x - 4)

Answer 1

Resposta:

A) 3 . (3 + x) = 5 . (x + 2)

9 + 3x = 5x + 10

3x - 5x = 10 - 9

- 2x = 1 . (-1)

2x = -1

x = - 1 ÷ 2

x = - 0,5

B) 2 . (3 + x) = 10

6 + 2x = 10

2x = 10 - 6

2x = 4

x = 4 ÷ 2

x= 2

C) 5 . (2 - x) = 5

10 - 5x = 5

- 5x = 5 - 10

- 5x = - 5 . (-1)

5x = 5

x = 5 ÷ 5

x = 1

D) 6 . (x + 1) = 24

6x + 6 = 24

6x = 24 - 6

6x = 18

x = 18 ÷ 6

x = 3

E) - 9 . (x - 4) = 9

- 9x - 36 = 9

- 9x = 9 + 36

- 9x = 45

x = 45 ÷ 9

x = 5

F) 4 . (x + 2) = -10

4x + 8 = - 10

4x = - 10 - 8

4x = -18

x = -18 ÷ 4

x = - 4,5

G) É igual a letra A

H) 2 . (x - 2) = 3 . (7 + 2x)

2x - 4 = 21 + 6x

2x - 6x = 21 + 4

- 4x = 25

x = 25 ÷ 4

x = 6,25

I) 5 . (8 - 4x) = 2 . (6x + 4)

40 - 20x = 12x + 8

-20x - 12x = 8 - 40

- 32x = - 32 . (-1)

32x = 32

x = 32 ÷ 32

x = 1

J) 4 . (3x + 6) = 3 . (7 + 5x)

12x + 24 = 21 + 15x

12x - 15x = 21 - 24

- 3x = - 3 . (-1)

3x = 3

x = 3 ÷ 3

x = 1

K) 2 . (5 - 2x) = 4 . (3 - 2x)

10 - 4x = 12 - 8x

- 4x + 8x = 12 - 10

4x = 2

x = 2 ÷ 4

x = 0,5

L) 3 . (x + 6) = 5 . ( x - 4)

3x + 18 = 5x - 20

3x - 5x = - 20 - 18

- 2x = - 38 . (-1)

2x = 38

x = 38 ÷ 2

x = 19