2-1/4= 7-5/12= 8-2 1/7= 4-3 5/9= 3 1/5-1 4/5= 6 1/8-2 3/8= 4 5/11-3 9/11= 8 4/13-8/13=

2 - 1/4 = (2 * 4 - 1 * 1)/4 = (8 - 1)/4 = 7/4 = 1 3/4;Ответ: 1 3/4.7 - 5/12 = (7 * 12 - 5 * 1)/12 = (84 - 5)/12 = 79/12 = 6 7/12;Ответ: 6 7/12.8 - 2 1/7 = 8 - 15/7 = (8 * 7 - 15 * 1)/7 = (56 - 15)/7 = 41/7 = 5 6/7;Ответ: 5 6/7.4 - 3 5/9 = 4 - 32/9 = (4 * 9 - 32 * 1)/9 = (36 - 32)/9 = 4/9;Ответ: 4/9.3 1/5 - 1 4/5 = 16/5 - 9/5 = 7/5 = 1 2/5;Ответ: 1 2/5.6 1/8 - 2 3/8 = 49/8 - 19/8 = 30/8 = 15/4 = 3 3/4;Ответ: 3 3/4.4 5/11 - 3 9/11 = 49/11 - 42/11 = 7/11;Ответ: 7/11.8 4/13 - 8/13 = 108/13 - 8/13 = 100/13 = 7 9/13.Ответ: 7 9/13.