7 Найдите значение выражения 1/2 + 5/6 : (1 1/2 - 3/4) · 1 1/4.

1/2 + 5/6 : (3/2 - 3/4) * 5/4 = 1/2 + 5/6 : (6/4 - 3/4) * 5/4 = 1/2 + 5/6 : 3/4 * 5/4 = 1/2 + 5/6 * 4/3 * 5/4 = 1/2 + 20/18 * 5/4 = 1/2 + 10/9 * 5/4 = 1/2 + 50/36 = 1/2 + 25/18 = 9/18 + 25/18 = 34/18 = 17/9.