Вычислите значение выражения (4 ц. 2/5: 1 ц. 3/5+2 4/7-8 ц. 1/2: 14): (2 ц. 3/8-1ц. 11/14)

(4 2/5 : 1 3/5 + 2 4/7 - 8 1/2 : 14) : (2 3/8 - 1 11/14) = 8

1) 4 2/5 : 1 3/5 = 22/5 : 8/5 = 22/5 * 5/8 = (11*1)/(1*4) = 11/4 = 2 3/4
2) 8 1/2 : 14 = 17/2 * 1/14 = 17/28
3) 2 3/4 + 2 4/7 = 2 21/28 + 2 16/28 = 4 37/28 
4) 4 37/28 - 17/28 = 4 20/28 = 4 5/7
5) 2 3/8 - 1 11/14 = 2 21/56 - 1 44/56 = 1 77/56 - 1 44/56 = 33/56
6) 4 5/7 : 33/56 = 33/7 * 56/33 = 56/7 = 8