Solve the following equations: 1. \( x : 5 = 900 - 800 \) 2. \( 40 : x = 90 - 70 \) 3. \( 4 X x = 84 - 60 \)

Решение:

1. \( x : 5 = 900 - 800 \)
   \( x : 5 = 100 \)
   \( x = 100 \times 5 \)
   \( x = 500 \)
2. \( 40 : x = 90 - 70 \)
   \( 40 : x = 20 \)
   \( x = 40 : 20 \)
   \( x = 2 \)
3. \( 4 X x = 84 - 60 \)
   \( 4 X x = 24 \)
   \( x = 24 : 4 \)
   \( x = 6 \)

Ответ: 1. x = 500; 2. x = 2; 3. x = 6.