Respostas

2014-02-02T22:36:04-02:00
A) 2(x-1)+3(x+1)=4(x+2)
2x-2+3x+3=4x+8
x=2-3+8
x=-1+8
x=7
_________________
B) 2(x+1)+5(x-1)=7
2x+2+5x-5=7
7x=10
x=10   ou  x= 1,4
     7
1 5 1
2014-02-02T22:44:27-02:00
Letra A) 2(x-1)+3(x+1)=4(x+2)
2x-2+3x+3=4x+8
x=7


Letra B) 2(x+1)+5(x-1)=7
2x+2+5x-5=7
7x=10
x=10/7
x=1.4
espero ter ajudado