\(\frac{1-a}{4a+8b} \cdot \frac{a^2+4ab+4b^2}{3-3a} = \frac{1-a}{4(a+2b)} \cdot \frac{(a+2b)^2}{3(1-a)} = \frac{(1-a)(a+2b)^2}{12(a+2b)(1-a)}\)
\(\frac{(1-a)(a+2b)^2}{12(a+2b)(1-a)} = \frac{a+2b}{12}\)
\(\frac{a+2b}{12} = \frac{-5+2(1)}{12} = \frac{-5+2}{12} = \frac{-3}{12} = -\frac{1}{4}\)
Ответ: -0.25