\[\frac{2a + 7b}{3} + \frac{3a - 14b}{6}\]
\[a = 0\ \ и\ b = 2,3:\]
\[\frac{2 \cdot 0 + 7 \cdot 2,3}{3} + \frac{3 \cdot 0 - 14 \cdot 2,3}{6} =\]
\[= \frac{{16,1}^{\backslash 2}}{3} + \frac{- 32,2}{6} =\]
\[= \frac{32,2}{6} - \frac{32,2}{6} = 0.\]