8) 9-1=

в) $$9 - 1\frac{5}{71} = 8\frac{71}{71} - 1\frac{5}{71} = (8 - 1) + (\frac{71}{71} - \frac{5}{71}) = 7 + \frac{66}{71} = 7\frac{66}{71}$$

Ответ: $$7\frac{66}{71}$$