А).5 1/21 - 2 1/3 - 2 - 1 = 3 20/42 - 7/3 = 3 20/42 - 14/42 = 3 6/42 = 3 1/7
Б).4 1/5 - 1 6/35 - 1 + 5/7 = 4 1/5 - 1 6/35 - 1 + 5/7 = 4 1/5 - 1 6/35 - 7/7 + 5/7 = 3 35/35 - 6/35 - 1/7 = 3 + 29/35 - 5/35 = 3 + 24/35 = 3 24/35
А).
5 1/21 - 2 1/3 - 2 - 1 = 3 20/42 - 7/3 = 3 20/42 - 14/42 = 3 6/42 = 3 1/7
Б).
4 1/5 - 1 6/35 - 1 + 5/7 = 4 1/5 - 1 6/35 - 1 + 5/7 = 4 1/5 - 1 6/35 - 7/7 + 5/7 = 3 35/35 - 6/35 - 1/7 = 3 + 29/35 - 5/35 = 3 + 24/35 = 3 24/35