№1.
1/3 * (2 2/15 * 6 1/4 - 5 1/3 * 1 1/8) + 4 5/9 = 7
1) 2 2/15 * 6 1/4 = 32/15 * 25/4 = 40/3 = 13 1/3
2) 5 1/3 * 1 1/8 = 16/3 * 9/8 = 6
3) 13 1/3 - 6 = 7 1/3
4) 1/3 * 7 1/3 = 1/3 * 22/3 = 22/9 = 2 4/9
5) 2 4/9 + 4 5/9 = 7
№2.
30 4/5 - 1 2/5 * (1 4/5 * (12 7/12 - 9 19/36) - 17/35 * 1 11/34) = 24
1) 12 7/12 - 9 19/36 = 12 21/36 - 9 19/36 = 3 2/36 = 3 1/18
2)1 4/5 * 3 1/18 = 9/5 * 55/18 = 11/2 = 5 1/2
3) 17/35 * 1 11/34 = 17/35 * 45/34 = 9/14
4) 5 1/2 - 9/14 = 5 7/14 - 9/14 = 4 21/14 - 9/14 = 4 12/14 = 4 6/7
5) 1 2/5 * 4 6/7 = 7/5 * 34/7 = 34/5 = 6 4/5
6) 30 4/5 - 6 4/5 = 24