4×(6/5) si 5×(1/4)=> 24/20 si 5/20
4×( 11/20) si 23/80=> 44/80 si 23/80
5×(3/25) si 3/50=> 15/50 si 3/50
4×(1/3) si 3×(17/4)=> 4/12 si 51/1
10×(9/25) si 3/259=> 90/250 si 3/250
3×(101/225) si 103/675=> 303/675 si 103/675
5×(3/7) si 7×(2/5)=> 15/35 si 14/35
2×(1/45) si 5×(1/90)=> 2/90 si 1/90