$$1\frac{1}{5} - \frac{47}{10} = \frac{1 \cdot 5 + 1}{5} - \frac{47}{10} = \frac{6}{5} - \frac{47}{10} = \frac{6 \cdot 2}{5 \cdot 2} - \frac{47}{10} = \frac{12}{10} - \frac{47}{10} = - \frac{35}{10} = -3,5$$
Ответ: -3,5