(11 5/11 - 8 21/22): 1 2/3= с меня 30 : )

1) 11 ( 5/11 ) - 8 ( 21/22 ) = 11 ( 10/22 ) - 8 ( 21/22 ) = 10 ( 32/22 ) - 8 ( 21/22 ) =
= 2 ( 11/22 ) = 2 ( 1/2 ) 
2) 2 ( 1/2 ) : 1 ( 2/3 ) = 5/2 : 5/3 = 3/2 = 1,5
ОТВЕТ 1,5

(11 5/11 - 8 21/22):1 2/3 = (252-197)/22 : 5/3 = 55/22 : 5/3 = 55/22*3/5 = 33/22 = 3/2 = 1 1/2 или 1,5