3. Найдите значение выражения: \(11\frac{1}{5} - 15a\), при \(a = \frac{1}{5}; \frac{2}{3}\)

Решение: 1) При \(a = \frac{1}{5}\): \(11\frac{1}{5} - 15 \cdot \frac{1}{5} = \frac{56}{5} - \frac{15}{5} = \frac{41}{5} = 8\frac{1}{5}\) 2) При \(a = \frac{2}{3}\): \(11\frac{1}{5} - 15 \cdot \frac{2}{3} = \frac{56}{5} - \frac{30}{3} = \frac{56}{5} - 10 = \frac{56}{5} - \frac{50}{5} = \frac{6}{5} = 1\frac{1}{5}\) Ответ: При \(a = \frac{1}{5}\): \(8\frac{1}{5}\) При \(a = \frac{2}{3}\): \(1\frac{1}{5}\)