\[\boxed{\text{113.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 15x^{2} \cdot \frac{7}{bx^{3}} = \frac{15x^{2} \cdot 7}{bx³} = \frac{35}{2x}\]
\[\textbf{б)}\frac{25}{16y^{2}} \cdot 2y^{2} = \frac{25 \cdot 2y^{2}}{16y^{2}} = \frac{25}{8} =\]
\[= 3\frac{1}{8}\]
\[\textbf{в)}\ 6am^{2} \cdot \frac{4a}{3m^{3}} = \frac{6am^{2} \cdot 4a}{3m^{3}} =\]
\[= \frac{8a^{2}}{m}\ \]
\[\textbf{г)}\frac{2b}{5a^{3}} \cdot 10a^{2} = \frac{2b \cdot 10a²}{5a³} = \frac{4b}{a}\ \]