Ответ:

  1. \(\frac{3^2\cdot4^3\cdot12^2}{9^2\cdot6^3}=\frac{3^2\cdot2^6\cdot(2^2\cdot3)^2}{3^4\cdot(2\cdot3)^3}=\frac{2^7}{3}=\frac{128}{3}\).
  2. \(\frac{5^2\cdot6^4\cdot12^2}{15^2\cdot9^3}=\frac{5^2\cdot(2\cdot3)^4\cdot(2^2\cdot3)^2}{(3\cdot5)^2\cdot3^6}=\frac{2^8}{3^2}=\frac{256}{9}\).
  3. \(\frac{12^2\cdot4^3\cdot6^2}{8^2\cdot18^3}=\frac{(2^2\cdot3)^2\cdot2^6\cdot(2\cdot3)^2}{2^6\cdot(2\cdot3^2)^3}=\frac{2^6}{3^5}=\frac{64}{243}\).
  4. \(\frac{(2^3)^3\cdot9^7\cdot2^2}{81^2\cdot2^3}=\frac{2^9\cdot3^{14}\cdot2^2}{3^8\cdot2^3}=2^8\cdot3^6=186624\).

Ответ: 1) \(\frac{128}{3}\); 2) \(\frac{256}{9}\); 3) \(\frac{64}{243}\); 4) 186624.