Respuestas

2013-12-02T21:16:41+01:00
1) (2/3.1/4) - (2/3.5/2)

2) (-3/5.4) - (6.4)

3) (1/4.2/4) + (1/4.3/5)

4) (4/3.3/2) + (5/2.3/2)