Найдите значение выражения

1. $\left(\frac{3x^3}{a^4}\right)^4 \cdot \left(\frac{a^5}{3x^4}\right)^3 = \frac{3^4 x^{12}}{a^{16}} \cdot \frac{a^{15}}{3^3 x^{12}} = \frac{81}{27} \cdot \frac{x^{12}}{x^{12}} \cdot \frac{a^{15}}{a^{16}} = 3 \cdot \frac{1}{a} = \frac{3}{a} = \frac{3}{-1/4} = -12$. 2. $\left(\frac{3x^4}{a^5}\right)^5 \cdot \left(\frac{a^6}{3x^5}\right)^4 = \frac{3^5 x^{20}}{a^{25}} \cdot \frac{a^{24}}{3^4 x^{20}} = \frac{243}{81} \cdot \frac{x^{20}}{x^{20}} \cdot \frac{a^{24}}{a^{25}} = 3 \cdot \frac{1}{a} = \frac{3}{a} = \frac{3}{-1/7} = -21$. 3. $\frac{3(6a^5)^2}{a^5 a^7} = \frac{3 \cdot 36 a^{10}}{a^{12}} = \frac{108}{a^2} = \frac{108}{4^2} = \frac{108}{16} = 6,75$. 4. $b^{-19} \cdot (4b^7)^3 = b^{-19} \cdot 64 b^{21} = 64 b^{21-19} = 64 b^2 = 64 \cdot (-0,5)^2 = 64 \cdot 0,25 = 16$. 5. $\frac{2(3a^2)^3}{a^6 a^2} = \frac{2 \cdot 27 a^6}{a^8} = \frac{54}{a^2} = \frac{54}{12^2} = \frac{54}{144} = \frac{3}{8} = 0,375$. 6. $\frac{16(a^2 b^4)^2}{a^5 b^8} = \frac{16 a^4 b^8}{a^5 b^8} = \frac{16}{a} = \frac{16}{2} = 8$. 7. $\frac{5(2k^5)^4}{k^{17} k^5} = \frac{5 \cdot 16 k^{20}}{k^{22}} = \frac{80}{k^2} = \frac{80}{10^2} = \frac{80}{100} = 0,8$. 8. $\frac{36(x^7 y^5)^3}{x^{22} y^{15}} = \frac{36 x^{21} y^{15}}{x^{22} y^{15}} = \frac{36}{x} = \frac{36}{-12} = -3$. 9. $\frac{4(4a^4)^2}{a^3 a^7} = \frac{4 \cdot 16 a^8}{a^{10}} = \frac{64}{a^2} = \frac{64}{20^2} = \frac{64}{400} = 0,16$. 10. $\frac{4(a^2 b)^2}{a^4 b^3} = \frac{4 a^4 b^2}{a^4 b^3} = \frac{4}{b} = \frac{4}{2} = 2$.