Odpowiedź:
A) 3/4*1/5=3/20
6/8*1/4=6/32=3/16
5/8*1 i 1/3=5/8*4/3=20/24=5/6
4/12*3 i 1/2=4/12*7/2=28/24= 1 i 4/24 = 1 i 1/6
B) 2 i 3/5*1 i 3/7 =13/5*10/7=130/35=3 i 25/35 =3 i 5/7
1 i 3/4*2 i 2/3=7/4*8/3=56/12=4 i 8/12=4 i 2/3
1 i 5/6*2 i 4/7=11/6*18/7=198/42=4 i 30/42=4 i 5/7
2 i 1/3*3 i 2/8=7/3+26/8=182/24=7 i 14/24=7 i 7/12
