(3ц 2\3 -1ц 7\9) :( 1\2-1\4)+(2ц 1\2) +1ц 3\4) х (3\34 + 2\14) : 9\56=

(3 2/3 - 1 7/9) : (1/2 - 1/4) + (2 1/2 + 1 3/4) * (3/34 + 2/14) : 9/56 = (11/3-16/9) : (1/2-1/4) + (5/2+7/4) * (3/34+2/14) : 9/56 = (33-16)/9 : (2-1)/4 + (10+7)/4 * (21+34)/238 : 9/56 = 17/9 : 1/4 + 17/4 * 55/238 : 9/56 = 17/9 * 4/1 + 17/4 * 55/238 * 56/9 = 68/9 + 55/56 * 56/9 = 68/9 + 55/9 = 123/9 = 13 6/9 = 13 2/3