\[\frac{2x - 6y}{0,25x^{2} - 2,25y^{2}} =\]
\[= \frac{2 \cdot (x - 3y)}{0,25 \cdot \left( x^{2} - 9y^{2} \right)} =\]
\[= \frac{2 \cdot (x - 3y)}{0,25 \cdot (x - 3y)(x + 3y)} =\]
\[= \frac{8}{x + 3y} = \frac{8}{8} = 1.\]