1) \frac{1}{81} * \frac{9}{x^{-4}y^{6}} = \frac{9}{81x^{-4}y^{6}} = \frac{1}{9x^{-4}y^{6}}
2) \frac{1}{100n^{10}k^{4}} * \frac{9}{x^{-4}y^{6}} = \frac{9}{100n^{10}k^{4}x^{-4}y^{6}} = \frac{9}{100n^{10}k^{4}x^{4}y^{-6}}
1) \frac{1}{81} * \frac{9}{x^{-4}y^{6}} = \frac{9}{81x^{-4}y^{6}} = \frac{1}{9x^{-4}y^{6}}
2) \frac{1}{100n^{10}k^{4}} * \frac{9}{x^{-4}y^{6}} = \frac{9}{100n^{10}k^{4}x^{-4}y^{6}} = \frac{9}{100n^{10}k^{4}x^{4}y^{-6}}