\[\boxed{\text{75\ (75).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{15a - b^{\backslash 3}}{12a} - \frac{a - 4b^{\backslash 4}}{9a} =\]
\[= \frac{45a - 3b - 4a + 16b}{36a} =\]
\[= \frac{41a + 13b}{36a}\]
\[\textbf{б)}\ \frac{7x + 4^{\backslash 3}}{8y} - \frac{3x - 1^{\backslash 4}}{6y} =\]
\[= \frac{21x + 12 - 12x + 4}{24y} =\]
\[= \frac{9x + 16}{24y}\]
\[\boxed{\text{75.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[= \frac{3x}{6} + \frac{2y}{6} = \frac{3x + 2y}{6}\ \]
\[= \frac{3c}{12} - \frac{d}{12} = \frac{3c - d}{12}\]
\[= \frac{a^{2} - b^{3}}{\text{ab}}\]
\[= \frac{9 - 4}{6x} = \frac{5}{6x}\]
\[= \frac{5x + 2x}{8y} = \frac{7x}{8y}\]
\[\textbf{е)}\ \frac{17y^{\backslash 3}}{24c} - \frac{25y^{\backslash 2}}{36c} =\]
\[= \frac{51y - 50y}{72c} = \frac{y}{72c}\]
\[= \frac{5 - 8}{25a} = - \frac{3}{25a}\]
\[\textbf{з)}\ \frac{3b^{\backslash b}}{4c} + \frac{c^{\backslash 2c}}{2b} =\]