Respuestas

2013-05-16T23:37:02+02:00
Hola!! =D

1. 3/2 + 5/3 = (3x3 + 5x2 )/(2x3) = 19/6
2. 3/7 - 4/9 = (3x9 - 4x7 )/(7x9) = -1/63

Espero que te sirva, chaito ;P