Ответ:
а) \(\frac49\cdot\frac{63}{64}:\frac27=\frac49\cdot\frac{63}{64}\cdot\frac72=\frac{49}{32}\).
б) \(\left(\frac12\right)^3\cdot\frac56\cdot\frac7{15}=\frac18\cdot\frac56\cdot\frac7{15}=\frac7{144}\).
в) \(\left(1-\frac13\right):\left(\frac13-\frac14\right)=\frac23:\frac1{12}=8\).
Ответ: а) \(\frac{49}{32}\); б) \(\frac7{144}\); в) \(8\).
