Найдите значение выражения: (3a-2ab)/(ab-5b^2)+(15b-10b^2)/(5b^2-ab).

\[\frac{3a - 2ab}{ab - 5b^{2}} + \frac{15b - 10b^{2}}{5b^{2} - ab} =\]

\[= \frac{3a - 2ab}{ab - 5b^{2}} - \frac{15b - 10b^{2}}{ab - 5b^{2}} =\]

\[= \frac{3a - 2ab - 15b + 10b^{2}}{ab - 5b^{2}} =\]

\[= \frac{a(3 - 2b) - 5b(3 - 2b)}{b(a - 5b)} =\]

\[= \frac{(3 - 2b)(a - 5b)}{b(a - 5b)} = \frac{3 - 2b}{b};\ \]

\[a = 199;b = 300:\]

\[\frac{3 - 2 \cdot 300}{300} = - \frac{597}{300} =\]

\[= - \frac{199}{100} = - 1,99.\]