Ответ: \(-\frac{7}{40}\)
Разбираемся:
\[1 \frac{1}{10} = \frac{1 \cdot 10 + 1}{10} = \frac{11}{10}\]
\[\frac{11}{10} - \frac{3}{8}\]
\[\frac{11}{10} = \frac{11 \cdot 4}{10 \cdot 4} = \frac{44}{40}\] \[\frac{3}{8} = \frac{3 \cdot 5}{8 \cdot 5} = \frac{15}{40}\]
\[\frac{44}{40} - \frac{15}{40} = \frac{44 - 15}{40} = \frac{29}{40}\]
\[1 \frac{1}{10} - \frac{3}{8} = \frac{44}{40} - \frac{15}{40} = \frac{29}{40}\]
\[\frac{29}{40} - 1 = \frac{29}{40} - \frac{40}{40} = -\frac{11}{40}\]
Ответ: \(-\frac{11}{40}\)