Найдите значени выражения: 2 3/4-1 5/6; 4 2/5+3 5/6; 7 5/12 - (1 5/8+2 1/24)

2 3/4 - 1 5/6 = 11/4 - 11/6 = (11 * 3 - 11 * 2)/12 = (33 - 22)/12 = 11/12;

Ответ: 11/12.

4 2/5 + 3 5/6 = 22/5 + 23/6 = (22 * 6 + 23 * 5)/30 = (132 + 115)/30 = 247/30 = 8 7/30;

Ответ: 8 7/30.

7 5/12 - (1 5/8 + 2 1/24) = 89/12 - (13/8 + 49/24) = 89/12 - (13 * 3 + 49 * 1)/24 = 89/12 - (39 + 49)/24 = 89/12 - 98/24 = (89 * 2 - 98 * 1)/24 = (178 - 98)/24 = 80/24 = 10/3 = 3 1/3.

Ответ: 3 1/3.