\[\boxed{\text{138.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{11m^{4}}{6n^{2}} \cdot \frac{5m}{6n^{3}}\ :\frac{11n^{3}}{12m^{3}} =\]
\[= \frac{11m^{4}}{6n²} \cdot \frac{5m}{6n³} \cdot \frac{12m³}{11n³} = \frac{5m^{8}}{3n^{8}}\]
\[\textbf{б)}\ \frac{8x^{3}}{7y^{3}}\ :\frac{4x^{4}}{49y^{2}}\ :\frac{7x}{y^{2}} =\]
\[= \frac{8x^{3}}{7y^{3}} \cdot \frac{49y^{2}}{4x^{4}} \cdot \frac{y^{2}}{7x} = \frac{2y}{x²}\]