а. x= 3 8/9 - 1 5/9 x= 2 3/9= 2 1/3 x= 2 1/3 б. y-8 12/19 = 6 2/19-1 7/19 y - 8 12/ 19 = 4 14/19 y = 4 14/19 + 8 12/19 y = 13 7/19