B) log√3 81√3; r) lg 1/√10.

1. в) $$log_{\sqrt{3}} 81\sqrt{3} = log_{3^{\frac{1}{2}}} (3^4 \cdot 3^{\frac{1}{2}}) = log_{3^{\frac{1}{2}}} 3^{\frac{9}{2}} = \frac{\frac{9}{2}}{\frac{1}{2}} log_3 3 = 9$$
2. г) $$lg \frac{1}{\sqrt[3]{10}} = lg 10^{-\frac{1}{3}} = -\frac{1}{3}$$

Ответ: в) 9, г) $$\frac{-1}{3}$$