Respostas

2013-11-17T17:38:14-02:00
1+1/4=5/4
2+1/2=5/2
1-1/3=2/3
2-1/4=7/4

5/4+5/2-2/3-7/4= 15/4-29/12 =  4/3 ou 1.3333