(9-1 1/3*4 2/7)*21/46 (1,75+2 1/3): (6,5-2/3 (5-1 1/3*1 1/6)*27/31 (4,1-2 3/4): (1 16/21+4 2/3) 0,12-1,375 1,325-2,41 1 2/,75) 0, 1/6) -4,2-3,/12) -2,4-1,/12) нужно.

(9-4/3*30/7)*21/46=(9-40/7)*21/46=(18/2-40/7)*21/46=(126/14-80/14)*21/46=46/14*21/46=3/2=1 1/2
(7/3+7/3)/(13/2-2/3)=(14/3):(39/6-4/6)=14/3:35/6=14/3*6/35=28/35
(5-4/3*7/6)*27/31=(5-28/18)*27/31=(5-14/9)*27/31=(15/3-14/9)*27/31=(45/9-14/9)*27/31=31/9*27/9=3