2. Составь все, какие сможешь, равенства, используя выражения.

Решение:

Из предоставленных выражений можно составить следующие равенства:

• 
  

  2 ⋅ 9 = 18

  
  
• 
  

  9 ⋅ 2 = 18

  
  
• 
  

  2 ⋅ 6 + 2 = 14

  
  
• 
  

  2 ⋅ 8 - 2 = 14

  
  
• 
  

  2 ⋅ 7 + 2 = 16

  
  
• 
  

  2 ⋅ 8 + 2 = 18

  
  
• 
  

  2 ⋅ 9 + 2 = 20

  
  
• 
  

  2 ⋅ 10 - 2 = 18

  
  

Ответ: 2 ⋅ 9 = 18, 9 ⋅ 2 = 18, 2 ⋅ 6 + 2 = 14, 2 ⋅ 8 - 2 = 14, 2 ⋅ 7 + 2 = 16, 2 ⋅ 8 + 2 = 18, 2 ⋅ 9 + 2 = 20, 2 ⋅ 10 - 2 = 18.