oblicz a)6 - 1 3/7 b)10 - 2 3/5 c)8 - 5 5/7 d)4 1/8 - 1 2/8 e)8 7/9 - 6 8/9 f)8 3/20 - 1 17/20 g)6 6/25 - 5 8/25 h)13 11/13 - 12 12/13 i)25 3/17 - 18 4/17

a). 6 - 1 i 3/7 = 5 i 7/7 - 1 i 3/7 = 4 i 4/7 b). 10 - 2 i 3/5 = 9 i 5/5 - 2 i 3/5 = 7 i 2/5 c). 8 - 5 i 5/7 = 7 i 7/7 - 5 i 5/7 = 2 i 2/7 d). 4 i 1/8 - 1 i 2/8 = 3 i 9/8 - 1 i 2/8 = 2 i 7/8 e). 8 i 7/9 - 6 i 8/9 = 7 i 16/9 - 6 i 8/9 = 1 i 8/9 f). 8 i 3/20 - 1 i 17/20 = 7 i 23/20 - 1 i 17/20 = 6 i 6/20 = 6 i 3/10 g). 6 i 6/25 - 5 i 8/25 = 5 i 31/25 - 5 i 8/25 = 23/25 h). 13 i 11/13 - 12 i 12/13 = 12 i 24/13 - 12 i 12/13 = 12/13 i). 25 i 3/17 - 18 i 4/17 = 24 i 20/17 - 18 i 4/17 = 6 i 16/17