Răspuns:
a) 28/30:21/25=28/30*25/21=700/630=10/9 (am simplificat cu 70)
b) 32/49:2 2/7=32/49:2*7+2/7=32/49:16/7=32/49*7/16=2/7
c) 1 19/56: 2 8/21=1*56+19/56:2*21+8=75/56:50/21=75/56*21/50=1575/2800
