Срочно , сократите дробь 39/91,12/52,28/42,18/51,68/85,42/54,72/81,15/65,45/81,32/40,48/84,34/85,49/84,

Спасибо

3:7 3:13 2:3 6:17 4:5 7:9 8:9 3:13 5:9 4:5 4:7 2:5 7:12

39/91=3/712/52=3/1328/42=4/6=2/318/51=6/1768/85=42/54=21/27=7/972/81=8/915/65=3/1345/81=5/932/40=4/548/84=8/14=4/734/85=2/549/84=7/12