1) \(15 \cdot (\frac{1}{5})^2 - 8 \cdot \frac{1}{5} = 15 \cdot \frac{1}{25} - \frac{8}{5} = \frac{15}{25} - \frac{8}{5} = \frac{3}{5} - \frac{8}{5} = -\frac{5}{5} = -1\)
2) \(14 \cdot (\frac{1}{7})^2 - 23 \cdot \frac{1}{7} = 14 \cdot \frac{1}{49} - \frac{23}{7} = \frac{14}{49} - \frac{23}{7} = \frac{2}{7} - \frac{23}{7} = -\frac{21}{7} = -3\)
Ответ: 1) \(-1\); 2) \(-3\)