3. Упростите:

3. Упростите:

1. \( \frac{14a}{b^{-3}} \cdot \frac{b^{-2}}{56a^4} = \frac{14a \cdot b^{-2}}{b^{-3} \cdot 56a^4} = \frac{14}{56} \cdot \frac{a}{a^4} \cdot \frac{b^{-2}}{b^{-3}} = \frac{1}{4} \cdot a^{1-4} \cdot b^{-2 - (-3)} = \frac{1}{4} a^{-3} b^1 = \frac{b}{4a^3} \)
2. \( \frac{18x^{-6}}{y^5} \cdot \frac{7y^{-5}}{6x^{-12}} = \frac{18 \cdot 7}{6} \cdot \frac{x^{-6}}{x^{-12}} \cdot \frac{y^{-5}}{y^5} = 21 \cdot x^{-6 - (-12)} \cdot y^{-5-5} = 21 \cdot x^{6} \cdot y^{-10} = \frac{21x^6}{y^{10}} \)