7 1/2
Пошаговое объяснение:
(7 1/3 + 2 1/4) : 1/4 - 30 5/6 = ( 22/3 + 9/4 ) : 1/4 - 30 5/6 = ( 88/12 + 27/12) : 1/4 - 30 5/6 = 115/12 : 1/4 - 30 5/6 = 115/12 * 4/1 - 30 5/6 = 115/3 - 30 5/6 = 230/6 - 185/6 = 45/6 = 15/2 = 7 1/2
