Вычислите: ((1 1/4)в квадрате - 5/8) × 1 1/15-1/4

((1 1/4)² - 5/8) * 1 1/15 - 1/4 = 3/4,

1) (1 1/4)² = (5/4)² = 25/16 = 1 9/16,

2) 1 9/16 - 5/8 = 25/16 - 10/16 = 15/16,

3) 15/16 * 1 1/15 = 15/16 * 16/15 = 1,

4) 1 - 1/4 = 4/4 - 1/4 = 3/4