Respuestas

2012-03-02T04:38:42+01:00

(4/5)(5/8)=20/40 --> 1/2

1/2 / 5/2 = 2/10  --> 1/5 

2/3+1/5-2

5(2)+1(3)-2(15)/15

10+3-30/15 = -17/15