Question

Resolva as equações a seguir:
A)x/7=-2
B)3x/2-2x-5
C)x+x/2=10
D)x/4-x/5=-9/6

Answer 1

O sinal de igual da (b), não tem.

A)

x/7= -2

x = -2.7

x = - 14

B)

3x/2 = 2x-5

3x = 2.(2x - 5)

3x = 4x - 10

10 = 4x - 3x

10 = x

x = 10

C)

x+x/2=10

(2x + x)/2 = 2.10/2

3x = 20

x = 20/3

D)

x/4-x/5= -9/6 (:3)/(:3)

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

(5x - 4x)/20 = 10.(-3)/20

x = - 30

MMC (4,5,2) = 20

4,5,2: 2

2,5,1: 2

1,5,1: 5

1,1,1 = 2.2.5 = 20

x = - 30