1) 3/8 и 5/16 = 6/16 и 5/16
2) 19/80 и 13/16 = 19/80 и 65/80
3) 5/9 и 41/81 = 45/81 и 41/81
4) 11/75 и 14/15 = (14×5)/75=70/75
