Вопрос:

6. Вычислите: а) \(6\frac{1}{8}-8\); б) \(-2\frac{2}{7}+4\frac{3}{7}\); в) \(6\frac{1}{8}-6\frac{1}{4}\); г) \(\frac{3}{5}:(-\frac{9}{16})\); д) \(\frac{5}{12}\cdot(-6)\); е) \(-5\frac{2}{9}:5\).

Ответ:

  1. \(6\frac{1}{8}-8=\frac{49}{8}-\frac{64}{8}=-\frac{15}{8}=-1\frac{7}{8}\).
  2. \(-2\frac{2}{7}+4\frac{3}{7}=-\frac{16}{7}+\frac{31}{7}=\frac{15}{7}=2\frac{1}{7}\).
  3. \(6\frac{1}{8}-6\frac{1}{4}=\frac{49}{8}-\frac{50}{8}=-\frac{1}{8}\).
  4. \(\frac{3}{5}:\left(-\frac{9}{16}\right)=\frac{3}{5}\cdot\left(-\frac{16}{9}\right)=-\frac{16}{15}=-1\frac{1}{15}\).
  5. \(\frac{5}{12}\cdot(-6)=-\frac{30}{12}=-\frac{5}{2}=-2\frac{1}{2}\).
  6. \(-5\frac{2}{9}:5=-\frac{47}{9}\cdot\frac{1}{5}=-\frac{47}{45}=-1\frac{2}{45}\).

Ответ: а) \(-1\frac{7}{8}\); б) \(2\frac{1}{7}\); в) \(-\frac{1}{8}\); г) \(-1\frac{1}{15}\); д) \(-2\frac{1}{2}\); е) \(-1\frac{2}{45}\).