6. 28+42:7-6 96-72:9+15 32+56:8-7 100-7.8 90-8.8 80-9.8 74:□ = 8. (ост. □) 65:□ = 7 (ост.) 85:□ = 9 (ост. □)

Решение:

1. 28 + 42 : 7 - 6

   1. 42 : 7 = 6
   2. 28 + 6 = 34
   3. 34 - 6 = 28

   Ответ: 28

2. 96 - 72 : 9 + 15

   1. 72 : 9 = 8
   2. 96 - 8 = 88
   3. 88 + 15 = 103

   Ответ: 103

3. 32 + 56 : 8 - 7

   1. 56 : 8 = 7
   2. 32 + 7 = 39
   3. 39 - 7 = 32

   Ответ: 32

4. 100 - 7 ⋅ 8

   1. 7 ⋅ 8 = 56
   2. 100 - 56 = 44

   Ответ: 44

5. 90 - 8 ⋅ 8

   1. 8 ⋅ 8 = 64
   2. 90 - 64 = 26

   Ответ: 26

6. 80 - 9 ⋅ 8

   1. 9 ⋅ 8 = 72
   2. 80 - 72 = 8

   Ответ: 8

7. 74 : □ = 8 (ост. □)

   74 : 9 = 8 (ост. 2)

8. 65 : □ = 7 (ост.)

   65 : 9 = 7 (ост. 2)

9. 85 : □ = 9 (ост. □)

   85 : 9 = 9 (ост. 4)