24 - (3 целых 3/5 - 1 целая 7/9) : (1/2 - 1/3) = по действиям 4· (2 целых 1/2 + 1 целая 3/4) - (6 целых 2/3 + 4 целых 4/5) : 2 = по действиям

а) 1) 3 3/5 - 1 7/9 = 3 (9 * 3) / 45 - 1 (5 * 7) / 45 = 3 27/45 - 1 35/45 = 2 72/45 - 1 35/45 = 1 37/45;

2) 1/2 - 1/3 = 3 * 1/6 - 2 * 1/6 = 3/6 - 2/6 = 1/6;

3) 1 37/45 : 1/6 = 82/45 * 6/1 = 164/15 = 10 14/15;

4) 24 - 10 14/15 = 23 15/15 - 10 14/15 = 13 1/15.

Ответ: 13 1/15.

б) 1) 2 1/2 + 1 3/4 = 2 2/4 + 1 3/4 = 3 5/4 = 4 1/4;

2) 4 * 4 1/4 = 4/1 * 17/4 = 1/1 * 17/1 = 17/1 = 17;

3) 6 2/3 + 4 4/5 = 6 10/15 + 4 12/15 = 10 22/15 = 11 7/15;

4) 11 7/15 : 2 = 172/15 : 2/1 = 172/15 * 1/2 = 86/15 * 1/1 = 86/15 = 5 11/15;

5) 17 - 5 11/15 = 16 15/15 - 5 11/15 = 11 4/15.

Ответ: 11 4/15.