\[\boxed{\text{87.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{3x^{\backslash 3}}{5 \cdot (x + y)} - \frac{2y^{\backslash 5}}{3 \cdot (x + y)} =\]
\[\textbf{б)}\ \frac{{a^{2}}^{\backslash 4}}{5 \cdot (a - b)} - \frac{{b^{2}}^{\backslash 5}}{4 \cdot (a - b)} =\]
\[\textbf{в)}\ \frac{3}{ax - ay} + \frac{2}{by - bx} =\]
\[= \frac{3}{a \cdot (x - y)} + \frac{2}{b \cdot (y - x)} =\]
\[= \frac{3^{\backslash b}}{a \cdot (x - y)} - \frac{2^{\backslash a}}{b \cdot (x - y)} =\]
\[\textbf{г)}\ \frac{13c}{bm - bn} - \frac{12b}{cn - cm} =\]
\[= \frac{13c}{b \cdot (m - n)} - \frac{12b}{c \cdot (n - m)} =\]
\[= \frac{13c^{\backslash c}}{b \cdot (m - n)} + \frac{12b^{\backslash b}}{c \cdot (m - n)} =\]