=( 11 - 5 1/4 + 5 1/3) : (9 7/18 - 2 5/9) = (5 3/4 + 5 1/3) : (9 7/18 - 2 5/9) = 11 1/2 : (9 7/18 - 2 5/9)= 11 1/2 : 6 5/6= 1 28/41
=( 11 - 5 1/4 + 5 1/3) : (9 7/18 - 2 5/9) = (5 3/4 + 5 1/3) : (9 7/18 - 2 5/9) = 11 1/2 : (9 7/18 - 2 5/9)= 11 1/2 : 6 5/6= 1 28/41