А) 2 13/30 - (1 1/10 + 1\5) = 1 7/30
1) 1 1/10 + 1\5 = 11/10 + 1/5 = 11/10 + 2/10 = 12/10 = 6/5 = 1 1/5
2) 2 13\30 - 1 1/5 = 2 13/30 - 1 6/30 = 1 7/30
б) 2 8/15 - (1 3/10 + 2/5) = 5/6
1) 1 3/10 + 2/5 = 1 3/10 + 4/10 = 1 7/10
2) 2 8/15 - 1 7/10 = 2 16/30 - 1 21/30= 76/30 - 51/30 = 25/30 = 5/6
в) 4 14/45 - 1 7/15 - 3/5 = 1 4/9
1) 4 14/45 - 1 7/15 = 4 14/45 - 1 21/45 = 4 - 1- 1 + 7/45 = 2 7/45
2) 2 7/45 - 3/5 = 2 7/45 - 27/45 = 2- 1 + 20/45 = 1 4/9
г) 4 11/30 - 2 9/20 - 1/10= 2 1/60
1) 4 11/30 - 2 9/20 = 4 22/60 - 2 27/60 = 4 - 1 + 5/60 = 3 + 1/12 = 3 1/12
2) 3 1/12 - 1/10 = 3 5/60 - 6/60 = 3 - 1 + 1/60 = 2 1/60