(6 -4 8/15):2,2 (5,4- 2 1\3) :7 2\3 (7,6- 4 3\4) :1,9

А) 1) 6 - 4 8/15 = 5 15/15 - 4 8/15 = 1 7/15;2) 2,2 = 2 2/10 = 2 1/5;3) 1 7/15 : 2 1/5 = 22/15 : 11/5 = 22/15 * 5/11 = 2/3 * 1/1 = 2/3.Ответ: 2/3.Б) 1) 5,4 = 5 4/10 = 5 2/5;2) 5 2/5 - 2 1/3 = 5 3 * 2/15 - 2 5 * 1/15 = 5 6/15 - 2 5/15 = 3 1/15;3) 3 1/15 : 7 2/3 = 46/15 : 23/3 = 46/15 * 3/23 = 2/5 * 1/1 = 2/5.Ответ: 2/5.В) 1) 7,6 = 7 6/10 = 7 3/5;2) 7 3/5 - 4 3/4 = 7 4 * 3/20 - 4 5 * 3/20 = 7 12/20 - 4 15/20 = 6 32/20 - 4 15/20 = 2 17/20;3) 1,9 = 1 9/10;4) 2 17/20 : 1 9/10 = 57/20 : 19/10 = 57/20 * 10/19 = 3/2 * 1/1 = 3/2 = 1 1/2.Ответ: 1 1/2.