va rog ajutati ma .Am nevoie de ajutor,cat mai repede posibil

Răspuns:
5×2/3=10/15
7×3/4=21/28
5/7×3=15/21
5/2×9=45/18
3/8×4=12/32
5/9×6=30/54
4/9×5/8=20/72
8/9×6/7=46/63
21/20×10/7=210/140
2/7×8/5=16/35