Respuestas

2012-10-02T04:12:33+02:00

3/4+5/2= (3+2*5)/4 = 13/4

1/7+2/3= (3*1+7*2)/21=17/21

5/10-1/2= 1/2-1/2=0

5/4-1/3=(3*5-4*1)/12=11/12

3/5-4/2=3/5-2/1= (3-5*2)/5=-7/5