Respostas

2014-02-02T16:10:46-02:00
A) 5x=20
x=20/5
x=4

b) -2x=-10 .(-1)
2x=10
x=10/2
x=5

c)-40=-5x.(-1)
40=5x
40/5=x
x=8

d)x=33+11
x=44
1 5 1
2014-02-02T18:16:58-02:00
Letra a : 

5x = 25-5
5x = 20
x = 20 / 5
x = 4

Letra b : 

-2x = -10 
x = -10 / -2
x = 5

Letra c : 

-40 = - 5x
- 5 x = - 40
x = - 40 / -5
x = 8

Letra d : 

x - 11 = 33
x = 33 + 11
x = 44
2 5 2