Respuestas

2013-08-12T21:20:48+02:00

1) 3/4+(-3/4)= 3-3/4=0/4=0
2)5/4+1/6=15+2/12=17/12
3)5/7+1/7=6/7
4)3/4+0=3/4
5)1/2+(-1/2)=11-1/2=0