(7/12 - 8/15)² + 4/5 * (7/10 - 9/16) = 9/80 (или 0,1125),,
1) 7/12 - 8/15 = 35/60 - 32/60 = 3/60 = 1/20,
2) (1/20)² = 1/400 (или 0,0025),
3) 7/10 - 9/16 = 56/80 - 45/80 = 11/80,
4) 4/5 * 11/80 = 11/100 (или 0,11),
5) 1/400 + 11/100 = 1/400 + 44/400 = 45/400 = 9/80
(или 5) 0,0025 + 0,11 = 0,1125)