Question

Resolva as seguintes equações:
a) 5x + 3 = 38 b) 5x + 3 – 3 = 38 c) 5x = 35 d) 8x – 11 = 4x + 13 e) 4x – 11 = 13
f) 4x = 24 g) 9x  8  8 37  8 h) 8x = 30 – 2x h) 11x = 77 i) − 39 = −79
j)10 = + 8 k)15 = + 20 l) 3(x + 3 ) – 5 = 22 m) 2(2x + 7 ) + 3(3x – 5 ) = 3(4x – 5 ) – 1
n) 3( x + 2 ) = 2 ( x – 7) o) 4(2x –1 ) = 3( x+2 ) p) 4(2m-1) + 3m = 2(4m-1) – (2 –m)

Answer 1

Resposta:

a) 5x + 3 = 38

5x = 38-3

5x = 35

x = 35/5

x = 7

b) 5x + 3 – 3 = 38

5x = 38-3+3

5x = 38

x= 38/5

x = 7,6

c) 5x = 35

x = 35/5

x = 7

d) 8x – 11 = 4x + 13

8x-4x = 13+11

4x = 24

x = 24/4

x = 6

e) 4x – 11 = 13

4x = 13+11

4x = 24

x = 24/4

x = 6

f) 4x = 24

x = 24/4

x = 6

g) 9x  8  8 37  8

Não entendi os sinais !!

h) 8x = 30 – 2x

8x+2x = 30

10x = 30

x = 30/10

x = 3

h) 11x = 77

x = 77/11

x = 7

i) − 39 = −79

-39+79 = -40

j)10 = + 8

10-8 = 2

k)15 = + 20

15-20 = -5

l) 3(x + 3 ) – 5 = 22

3x+9-5 = 22

3x = 22-9+5

3x = 27-9

3x = 18

x = 18/3

x = 6

m) 2(2x + 7 ) + 3(3x – 5 ) = 3(4x – 5 ) – 1

4x+14+9x-15 = 12x-15-1

4x+9x-12x = -15-1+15-14

13x-12x = +15-30

1x = -15

x = -15/1

x = -15

n) 3( x + 2 ) = 2 ( x – 7)

3x+6 = 2x-14

3x-2x = -14-6

1x = -20

x = -20/1

x = -20

o) 4(2x –1 ) = 3( x+2 )

8x-4 = 3x+6

8x-3x = 6+4

5x = 10

x = 10/5

x = 2

p) 4(2m-1) + 3m = 2(4m-1) – (2 –m)

8m-4+3m = 8m-2-2+1m

8m+3m-8m-1m = -2-2+4

11m-9m = 4-4

2m = 0

m = 0/2

m = 0

Se quiser confirmar os valores é só substituir o x .

Espero ter ajudado ;)