(2,5 -1 1/6)в квадрате×27/32-1 6/13

(2,5 -1 1/6)² * 27/32 - 1  6/13 = 1/26
1) 2,5 - 1  1/6 = 2 1/2 - 1 1/6 = 5/2 - 7/6 = 15/6 - 7/6 = 8/6
2) (8/6)² = 64/36
3) 64/36 * 27/32 = 2/4 * 3/1 = 6/4
4) 6/4 - 1 6/13 = 6/4 - 19/13 = 78/52 - 76/52 = 2/52 = 1/26