Ответ:

  1. \(7^2 = 7 \cdot 7 = 49\);
  2. \(6^3 = 6 \cdot 6 \cdot 6 = 216\);
  3. \(12^2 = 12 \cdot 12 = 144\);
  4. \(20^3 = 20 \cdot 20 \cdot 20 = 8000\).