Respostas

2013-11-12T12:12:45-02:00
4/4+2/3          (mmc de 4 e 3= 12)
4/4=12/4=3.4=12/12
2/3=12/3=4.2=8/12
12/12+8/12= 20/12 ( Simplifica por 4)
20/12=
5/3= Extraindo o inteiro: 5/3= 1 2/3

2  1/5= 5.2=10+1= 11/5
3 1/7= 7.3=21+1= 22/7