181. 1) \((10n^2m^3)^4\); 2) \((8a^4b^7)^3\); 3) \((-2{,}3a^3b^4)^2\); 4) \((-2nm^3)^4\).

1. \((10n^2m^3)^4=10^4n^8m^{12}=10000n^8m^{12}\).
2. \((8a^4b^7)^3=8^3a^{12}b^{21}=512a^{12}b^{21}\).
3. \((-2{,}3a^3b^4)^2=(-2{,}3)^2a^6b^8=5{,}29a^6b^8\).
4. \((-2nm^3)^4=(-2)^4n^4m^{12}=16n^4m^{12}\).

Ответ: \(10000n^8m^{12};\ 512a^{12}b^{21};\ 5{,}29a^6b^8;\ 16n^4m^{12}\).