Respostas

2014-07-28T18:21:39-03:00
A)2/3+1/3+1/2+1/4+3+4
3/3+1/2+1/4+3+4  ⇒  3/3=1   ⇒1/2+1/4 (tira mmc=4)
1+3/4+3+4
8+0,75
8,75

b)mmc=9
108-5(tudo dividido por 9)
103/9
11,44...
c)6/4×1/2
6/8
0,75