Пошаговое объяснение:

№1

6. 4/15 - 2. 1/9 + 1. 3/10 = 5. 41/90

1) 6. 4/15 - 2. 1/9 = 6. 12/45 - 2. 5/45 = 4. 7/45

2) 4. 7/45 + 1. 3/10 = 4. 14/90 + 1. 27/90 = 5. 41/90

№2

7. 2/3 - 5. 5/36 + 3. 3/8 = 5. 65/72

1) 7. 2/3 - 5. 5/36 = 7. 24/36 - 5. 5/36 = 2. 19/36

2) 2. 19/36 + 3. 3/8 = 2. 38/72 + 3. 27/72 = 5. 65/72

№3

10. 9/22 - 3. 7/11 - 4. 8/33 = 2. 35/66

1) 10. 9/22 - 3. 7/11 = 10. 9/22 - 3. 14/22 = 9. 31/22 - 3. 14/22 = 6. 17/22

2) 6. 17/22 - 4. 8/33 = 6. 51/66 - 4. 16/66 = 2. 35/66

№4

12. 17/42 - (3. 1/4 + 4. 1/6) = 4. 83/84

1) 3. 1/4 + 4. 1/6 = 3. 3/12 + 4. 2/12 = 7. 5/12

2) 12. 17/42 - 7. 5/12 = 12. 34/84 - 7. 35/84 = 11. 118/84 - 7. 35/84 = 4. 83/84

№5

15 - (6. 4/35 - 2. 3/14) = 11. 1/10

1) 6. 4/35 - 2. 3/14 = 6. 8/70 - 2. 15/70 = 5. 78/70 - 2. 15/70 = 3. 63/70 = 3. 9/10

2) 15 - 3. 9/10 = 14. 10/10 - 3. 9/10 = 11. 1/10