3. Решите уравнения: 1) (x + 12) - 4 = 8; 2) (x - 13) + 5 = 5; 3) x : 2 = 16 : 4; 4) x * 3 = 8 * 6

Решение:

1. \( (x + 12) - 4 = 8 \)

\( x + 12 = 8 + 4 \)

\( x + 12 = 12 \)

\( x = 12 - 12 \)

\( x = 0 \)

2. \( (x - 13) + 5 = 5 \)

\( x - 13 = 5 - 5 \)

\( x - 13 = 0 \)

\( x = 13 \)

3. \( x : 2 = 16 : 4 \)

\( x : 2 = 4 \)

\( x = 4 \times 2 \)

\( x = 8 \)

4. \( x \times 3 = 8 \times 6 \)

\( x \times 3 = 48 \)

\( x = 48 : 3 \)

\( x = 16 \)

Ответ: 0; 13; 8; 16.