B) 2,2log2.2 5-2; r) 10lg 5 - 0,5

1. в) $$2.2^{log_{2.2} 5 - 2} = 2.2^{log_{2.2} 5} \cdot 2.2^{-2} = 5 \cdot \frac{1}{2.2^2} = \frac{5}{4.84} = \frac{500}{484} = \frac{125}{121}$$
2. г) $$10^{lg \space 5 - 0,5} = 10^{lg \space 5} \cdot 10^{-0,5} = 5 \cdot \frac{1}{\sqrt{10}} = \frac{5}{\sqrt{10}} = \frac{5\sqrt{10}}{10} = \frac{\sqrt{10}}{2}$$

Ответ: в) $$\frac{125}{121}$$, г) $$\frac{\sqrt{10}}{2}$$