Решить уравнения: x + 574 = 2000; a − 879 = 3143; 258 · y = 86020; x : 36 = 225; 135 : x = 27.

1. \(x + 574 = 2000\)

   \(x = 2000 - 574 = 1426\).

2. \(a - 879 = 3143\)

   \(a = 3143 + 879 = 4022\).

3. \(258 \cdot y = 86020\)

   \(y = 86020 : 258 = \frac{43010}{129} = 333\frac{53}{129}\).

4. \(x : 36 = 225\)

   \(x = 225 \cdot 36 = 8100\).

5. \(135 : x = 27\)

   \(x = 135 : 27 = 5\).

Ответ: 1426; 4022; \(333\frac{53}{129}\); 8100; 5.