\[\boxed{\text{47\ (47).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\frac{5b}{8a^{3}} = \frac{5b \cdot 3b^{2}}{8a^{3} \cdot 3b^{2}} = \frac{15b^{3}}{24a^{3}b^{2}}\]
\[\frac{7a}{3b^{2}} = \frac{7a \cdot 8a^{3}}{3b^{2} \cdot 8a^{3}} = \frac{56a^{4}}{24a^{3}b^{2}}\]
\[\frac{1}{2ab} = \frac{1 \cdot 12a^{2}b}{2ab \cdot 12a^{2}b} = \frac{12a^{2}b}{24b^{2}a^{3}}\]
\[\frac{2}{a^{2}b^{2}} = \frac{2 \cdot 24a}{a^{2}b^{2} \cdot 24a} = \frac{48a}{24a^{3}b^{2}}\]