\[\boxed{\text{556\ (556).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 100x^{5}y^{3} = 20x^{4}y \cdot 5xy^{2}\]
\[\textbf{б)} - 30x^{4}y^{5} = 20x^{4}y \cdot ( - 1,5y^{4})\]
\[\textbf{в)} - 4x^{16}y = 20x^{4}y \cdot \left( - 0,2x^{12} \right)\]
\[\textbf{г)}\ x^{10}y^{2} = 20x^{4}y \cdot \frac{1}{20}x^{6}y\]
\[\textbf{д)}\ 5x^{8}y = 20x^{4}y \cdot \frac{1}{4}x^{4}\]
\[\textbf{е)} - x^{4}y^{2} = 20x^{4}y \cdot \left( - \frac{1}{20}y \right)\]