Пошаговое объяснение:

15/80= 15:5/80:5= 5/16

24/30= 24:6/30:6= 4/5

28/32=28:4/32:4=7/8

45/75= 45:15/75:15=3/5

75/300=75:75/300:75=1/4

125/1000=125:125/1000:125=1/8

21/360=21:3/360:3=7/120

35/700=35:35/700:35=1/20

54/900=54:18/900:18=3/50

24/600=24:24/600:24=1/25

48/800=48:16/800:16=3/50