3) Выполни действия устно наиболее простым способом: a) 3 19/24 + (5 1/9 + 1 5/24) = б) (1 5/8 + 4 8/17) + (9/17 + 2 3/8) = в) 7 16/35 - (3 11/35 + 4 1/35) = г) (4 56/789 + 1 5/6) - 4 56/789 = д) (1 6/11 + 5 16/39) - 2 16/39 = е) 7 13/14 - (2 13/14 + 4 17/25) =

a) 3 19/24 + (5 1/9 + 1 5/24) = 3 19/24 + 1 5/24 + 5 1/9 = (3 + 1 + 19/24 + 5/24) + 5 1/9 = (4 + 24/24) + 5 1/9 = 5 + 5 1/9 = 10 1/9 б) (1 5/8 + 4 8/17) + (9/17 + 2 3/8) = 1 5/8 + 2 3/8 + 4 8/17 + 9/17 = (1 + 2 + 5/8 + 3/8) + (4 + 8/17 + 9/17) = (3 + 8/8) + (4 + 17/17) = 3 + 1 + 4 + 1 = 9 в) 7 16/35 - (3 11/35 + 4 1/35) = 7 16/35 - 3 11/35 - 4 1/35 = (7 - 3 - 4) + (16/35 - 11/35 - 1/35) = 0 + 4/35 = 4/35 г) (4 56/789 + 1 5/6) - 4 56/789 = 4 56/789 - 4 56/789 + 1 5/6 = 0 + 1 5/6 = 1 5/6 д) (1 6/11 + 5 16/39) - 2 16/39 = 1 6/11 + 5 16/39 - 2 16/39 = 1 6/11 + (5 - 2) + (16/39 - 16/39) = 1 6/11 + 3 + 0 = 4 6/11 е) 7 13/14 - (2 13/14 + 4 17/25) = 7 13/14 - 2 13/14 - 4 17/25 = (7 - 2) + (13/14 - 13/14) - 4 17/25 = 5 + 0 - 4 17/25 = 5 - 4 17/25 = 4 25/25 - 4 17/25 = 8/25