Выполни действия:

(9-2 3/11) + (2+1 9/11) =

28 2/21 - (14 17/21+11 8/21) =

(9-2 3/11) + (2+1 9/11) = 10 6/11

1) 9-2 3/11=6 8/11

2) 2+1 9/11=3 9/11

3) 6 8/11+3 9/11=9 17/11=10 6/11

28 2/21 - (14 17/21+11 8/21) = 1 19/21

1) 14 17/21+11 8/21=25 25/21=26 4/21

2) 28 2/21-26 4/21=27 23/21-26 4/21=1 19/21