Question

Oi, por favor ajudem-me
a)2x+8=x+13
b)2x/4-5/3=x-7/2
c)4x+2/3-5x-7/6=3-x/2
d)3/4=2x+5
NB:O / significa sobre

Answer 1

Resposta:

a) x = 5

b) x = 11/3

c) x = -7

d) -17/8

Explicação passo-a-passo:

LETRA A

2x + 8 = x + 13

2x - x = 13 - 8

x = 5

LETRA B

2x/4 - 5/3 = x - 7/2

2x/4 - x = -7/2 + 5/3

x/2 - x = -7(3)/6 + 5•2/6

x/2 - 2x/2 = -21/6 + 10/6

-x/2 = -11/6

-x•3/6 = -11/6

-3x/6 = -11/3

-3x = -11

3x = 11

x = 11/3

LETRA C

4x + 2/3 - 5x - 7/6 = 3 - x/2

4x - 5x + 2/3 - 7/6 = 3 - x/2

-x + 2/3 - 7/6 = 3 - x/2

-x + x/2 = 3 - 2/3 + 7/6

-x•2/2 + x/2 = 3•6/6 - 2•2/6 + 7/6

-2x/2 + x/2 = 18/6 - 4/6 + 7/6

-x/2 = 21/6

-x•3/6 = 21/6

-3x/6 = 21

-3x = 21

x = -21/3

x = -7

LETRA D

3/4 = 2x + 5

3 = (2x + 5)4

3 = 8x + 20

8x = 3 - 20

8x = -17

x = -17/8