(1/4 + 1/5 x= 1 4/5, ( 3 1/8 + 1 3/4) х =2 1/6, (2 1/12 -1 5/6) х = 3/4

№11/5 х = 1 4/5 - 1/4;1/5 х = 9/5 - 1/4;1/5 х = (9 * 4 - 1 * 5)/20;1/5 х = (36 - 5)/20;1/5 х = 31/20;х = 31/20 : 1/5;х = 31/20 * 5/1;х = 31/4;х = 7 3/4.Ответ: 7 3/4.№2(25/8 + 7/4) х = 13/6;(28 * 1 + 7 * 2)/8 х = 13/6;(28 + 14)/8 х = 13/6;42/8 х = 13/6;х = 13/6 : 42/8;х = 13/6 * 8/42;х = 13/3 * 2/21;х = 26/63.Ответ: 26/63.№3(25/12 - 11/6) х = 3/4;(25 * 1 - 11 * 2)/12 х = 3/4;(25 - 22)/12 х = 3/4;3/12 х = 3/4;х = 3/4 : 1/4;х = 3/4 * 4/1;х = 3.Ответ: 3.