Проверенный ( 4 - 2 5/6 - 5/12 ) * ( 7 1/12 - 5 3/4) =1 1) 4 - 2 5/6 3 6/6 - 2 5/6 1/6 2) 1 1/6 - 5/12 = 7/6 5/12 = 14/12 5/12 = 9/12 = 3/4 3) 7 1/12 - 5 3/4 = 85/12 23/4 = 85/12 - 69/12 = 16/12 = 4/3 = 1 1/3 4) 3/4 * 4/3 = 1
