${56}^{10}\cdot {\left(\frac{1}{7}\right)}^{10}:{0,8}^{10}={\left(56\cdot \frac{1}{7}:0,8\right)}^{10}={\left(8:0,8\right)}^{10}={\left(80:8\right)}^{10}={10}^{10}=10000000000$  

Odp. 10 zer.