- 2 5/12 * 11/18 - 1/6
- 2ц.5/12 * 11/18 - 1/6 = - 29/12 * 11/18 - 1/6 = - 319/216 - 1/6 = - 319/216 - 36/216 = = - 354/216 = -1целая 23/36