3. Найдите значение выражения: \(1\frac{7}{8}-3\frac{1}{2}-2\cdot\frac{30}{32}\)

1) \(1\frac{7}{8} = \frac{15}{8}\)

2) \(3\frac{1}{2} = \frac{7}{2}\)

3) \(\frac{30}{32} = \frac{15}{16}\)

4) \(2 \cdot \frac{15}{16} = \frac{15}{8}\)

5) \(\frac{15}{8} - \frac{7}{2} = \frac{15 - 7\cdot4}{8} = \frac{15-28}{8} = -\frac{13}{8}\)

6) \(-\frac{13}{8} - \frac{15}{8} = -\frac{28}{8} = -\frac{7}{2} = -3\frac{1}{2}\)

Ответ: \(-3\frac{1}{2}\)