2. 780:6, 570:3, 910:7, 6*130, 4*240, 3*170, 840:2+580, 650:5+170, 880:4-200

Решение:

Выполним вычисления по каждому примеру:

• 780 : 6

  780 | 6
- 6  | 130
--- 
  18
- 18
--- 
   00
-  0
--- 
    0

• 570 : 3

  570 | 3
- 3  | 190
--- 
  27
- 27
--- 
   00
-  0
--- 
    0

• 910 : 7

  910 | 7
- 7  | 130
--- 
  21
- 21
--- 
   00
-  0
--- 
    0

• 6 ⋅ 130 = 780
• 4 ⋅ 240 = 960
• 3 ⋅ 170 = 510
• 840 : 2 + 580 = 420 + 580 = 1000
• 650 : 5 + 170

  650 | 5
- 5  | 130
--- 
  15
- 15
--- 
   00
-  0
--- 
    0

650 : 5 + 170 = 130 + 170 = 300

• 880 : 4 - 200

  880 | 4
- 8  | 220
--- 
   08
-  8
--- 
    00
-   0
--- 
     0

880 : 4 - 200 = 220 - 200 = 20

Финальный ответ:

• 780 : 6 = 130
• 570 : 3 = 190
• 910 : 7 = 130
• 6 ⋅ 130 = 780
• 4 ⋅ 240 = 960
• 3 ⋅ 170 = 510
• 840 : 2 + 580 = 1000
• 650 : 5 + 170 = 300
• 880 : 4 - 200 = 20