Răspunsuri

Cel mai inteligent răspuns!
2014-10-27T20:34:40+02:00
=[-13/20-(12·4-3·15)/60]-[7/20+(9·21+15·4)/84]=
=[-13/20-3/60]-[7/20+249/84]=
=(-13·3-3)/60-(-7·21+249·5)/420=
=-36/30-1098/420=
=(-36·14-1098)/420=-1602/420=simplif=-267/70