Ответ:
Пошаговое объяснение:
1) 2 3/4 = (2 * 4 + 3)/4 = (8 + 3)/4 = 11/4;
2) 1 1/2 = (1 * 2 + 1)/2 = 3/2;
3) 3 5/6 = (3 * 6 + 5)/6 = (18 + 5)/6 = 23/6;
4) 11/4 - 3/2 - 23/6 = 3 * 11/(4 * 3) - 6 * 3/(2 * 6) - 2 * 23/(6 * 2) = 33/12 - 18/12 - 46/12 = (33 - 18 - 46)/12 = -31/12;
Ответ: -31/12.