Выполните действия: a) 1 9/11 + 2 3/11 = б) 3 2/9 + 1 7/9 = в) 4 1/3 - 2 2/3 = г) 26 2/5 - 17 3/5 =

a) 1 9/11 + 2 3/11 = (1 + 2) + (9/11 + 3/11) = 3 + 12/11 = 3 + 1 1/11 = 4 1/11

б) 3 2/9 + 1 7/9 = (3 + 1) + (2/9 + 7/9) = 4 + 9/9 = 4 + 1 = 5

в) 4 1/3 - 2 2/3 = 13/3 - 8/3 = 5/3 = 1 2/3

г) 26 2/5 - 17 3/5 = (25 - 17) + (7/5 - 3/5) = 8 + 4/5 = 8 4/5