1)4 целых 2\5+9 целых 3\7. 2) 2 целых 1\3+4целых 5\6. 3)

1) 4 2/5 + 9 3/7 = (4 * 5 + 2)/5 + (9 * 7 + 3)/7 = 22/5 + 66/7 = 7 * 22/35 + 5 * 66/35 = (154 + 330)/35 = 484/35;

2) 2 1/3 + 4 5/6 = (2 * 3 + 1)/3 + (4 * 6 + 5)/6 = 7/3 + 29/6 = 2 * 7/6 + 29/6 = (14 + 29)/6 = 43/64

3) 8 3/4 + 2 7/8 = (8 * 4 + 3)/4 + (2 * 8 + 7)/8 = 70/8 + 23/8 = 93/8;

4) 2 3/8 + 1 5/6 = (2 * 8 + 3)/8 + (1 * 6 + 5)/6 = 19/8 + 11/6 = 57/24 + 44/24 = 101/24;

5) 3 5/9 + 4 2/3 = 32/9 + 42/9 = 74/9;

6) 6 1/5 + 1 2/3 = 31/5 + 5/3 = 93/15 + 25/15 = 118/25;

7) 4 3/8 + 8 1/2 = 35/8 + 68/8 = 103/8;

9) 7 5/22 + 2 3/11 = 159/22 + 50/22 = 209/22.