Найдите значение выражения: (2a-3b)/(ab-4b^2)+(8b-12b^2)/(4b^2-ab).

\[\frac{2a - 3ab}{ab - 4b^{2}} + \frac{8b - 12b^{2}}{4b^{2} - ab} =\]

\[= \frac{2a - 3ab}{ab - 4b^{2}} - \frac{8b - 12b^{2}}{ab - 4b^{2}} =\]

\[= \frac{2a - 3ab - 8b + 12b^{2}}{ab - 4b^{2}} =\]

\[= \frac{a(2 - 3b) - 4b(2 - 3b)}{ab - 4b^{2}} =\]

\[= \frac{(2 - 3b)(a - 4b)}{b(a - 4b)} = \frac{2 - 3b}{b};\]

\[a = 199;\ \ b = 100:\]

\[\frac{2 - 3 \cdot 100}{100} = - \frac{298}{100} = - 2,98.\]