Решите: ((1 1/2 )^2-3/4): 1 2/5 (1 4/9 +2 5/6 - 2 3/4 ) *(5/11+10/20)

((1 1/2 )^2-3/4):1 2/5
((1/2)²-3/4)*2/5
(1/4-3/4)*2/5
-1/2*2/5
-1/5 или -0,2 

(1 4/9 +2 5/6 - 2 3/4 ) *(5/11+10/20)
(4/9+5/3-3/2)*21/22
11/18*21/22
1/6*7/2
7/12 или ≈0,58