Vreau acest ex! Va rog

1/5x2/3= 2/15
4/7x5/3=20/21
5/9x2/7=10/63
5x3/4=15/4
2/5x3=6/5
4/3x1/4=1/3
5/2x4/5=2
Sper ca te-am ajutat.