Упростите выражение и найдите его значение при а =12/27 8целых1/4а-(3целых1/6а-1целая1/15a)

8 1/4а - (3 1/6а - 1 1/15а) = 8 1/4 * 12/27 - (3 1/6 * 12/27 - 1 1/15 * 12/27) = 2 11/15;

1. 3 1/6 * 12/27 = 19/6 * 12/27 = 19 * 12/6 * 27 = 19 * 2/1 * 27 = 38/27 = 1 11/27;

2. 1 1/15 * 12/27 = 16/15 * 12/27 = 16 * 12/ 15 * 27 = 16 * 4/15 * 9 = 64/135;

3. 1 11/27 - 64/135 = 38/27 - 64/135 = 190/135 - 64/135 = 126/135 = 14/15;

4. 8 1/4 * 12/27 = 33/4 * 12/27 = 33 * 12/4 * 27 = 11 * 3/1 * 9 = 33/9 = 11/3 = 3 2/3;

5. 3 2/3 - 14/15 = 11/3 - 14/15 = 55/15 - 14/15 = (55 - 14)/15 = 41/15 = 2 11/15;