Надо Вычислить. 25/28-2/21, 41/54-35/72, 20/21-3/14, 40/143+39/110, 43/140+41/150, 73/80-37/100.

25/28-2/21=75/84-8/84=63/8441/54-35/72=328/432-210/432=118/43220/21-3/14=40/42-9/42=31/4240/143+39/110=сорян.....43/140...........тоже сорян73/80-37/100=3650/4000-1480/4000=2170/4000