Ответ:

  1. \(x : 19 = 24\)

    \(x = 24 \cdot 19 = 456\).

  2. \(252 : x = 14\)

    \(x = 252 : 14 = 18\).

  3. \((x + 8) : 9 = 12\)

    \(x + 8 = 12 \cdot 9 = 108\),

    \(x = 108 - 8 = 100\).

  4. \(x : 9 - 8 = 12\)

    \(x : 9 = 12 + 8 = 20\),

    \(x = 20 \cdot 9 = 180\).

  5. \(72 : (x - 6) = 12\)

    \(x - 6 = 72 : 12 = 6\),

    \(x = 6 + 6 = 12\).

  6. \(72 : x - 6 = 12\)

    \(72 : x = 12 + 6 = 18\),

    \(x = 72 : 18 = 4\).

Ответ: 1) \(x = 456\); 2) \(x = 18\); 3) \(x = 100\); 4) \(x = 180\); 5) \(x = 12\); 6) \(x = 4\).