Respostas

2014-02-18T10:34:16-03:00
A) x/3=5
x=5/3

b)5x-10=x-1/2
5x=x-1/2+10
5x-x=19/2
4x=19/2
x=19/2/4
x=19/2 * 4/1
x=76/2
x=36
1 5 1
2014-02-18T11:02:14-03:00
A) x/3-5=0 Multiplica cruzado
    x-5*1=0*3
    x-5=0
    x=5

b) 5x-10/1=x+1/2  Tira o múltiplo comum MMC ou multiplica cruzado
   10x-20= x+1
   10x-x= 20+1
   9x= 21
   x= 21/9
2 5 2