3) 2/11:3/5=2/11×5/3=10/33
1/4:7/5=1/4×5/7=5/28
c, d nu se vad
5/9:1/6=5/9×6=30/9=10/3
2/7: 1 1/3 = 2/7:4/3=2/7×3/4=6/28=3/14
5 1/2:4/3= 11/2:4/3=11/2×3/4= 33/8
