Respostas

2013-10-30T08:10:29-02:00
 (2/3)² : 2/9 mais 1/3
     1-1/4

(4/9):2/9 + 1/3
 4/4 - 1/4
 
4/9 . 9/2 +1/3
3/4

36/18 +1/3
3/4
simplificando 36/18 = 2
2 . 4/3 +1/3
8/3 + 1/3 = 9/3