510. 1. 1/16

2. 1/729

3 8/125

4. 64/343

5. 2 1/4

6. 49/36

7. 343/27

8. 343/8

511.

1. 1) 2/7 + 3 1/2 = 3 4+7/14 = 3 11/14

2) 3 11/14 · 4 2/3 = 53/14 · 14/3 = 53/3 = 17 2/3

2. (4 1/5 - 2 3/4) · 2 2/19

1) 4 1/5 - 2 3/4 = 2 4-15/20 = 1 24-15/20 = 1 9/20

2) 1 9/20 · 2 2/19 = 29/20 · 40/19 = 58/19 =  3 1/19

3. (5 6/7 + 3 5/21) · 2 1/10

1) 5 6/7 + 3 5/21 = 8 18+5/21 = 8 23/21 = 9 2/21

2) 9 2/21 · 2 1/10 = 191/21 · 21/10 = 191/10 = 19 1/10

4. 1) 7 5/12 - 3 1²/6 = 4 5²/12₁ = 4 3/2₁ = 4 1/4

2) 4 1/4 · 2 2/17 = 9

Фуух, надеюсь помог.