$$\frac{5^8 \cdot 2^{11}}{10^7} = \frac{5^8 \cdot 2^{11}}{(5 \cdot 2)^7} = \frac{5^8 \cdot 2^{11}}{5^7 \cdot 2^7} = 5^{8-7} \cdot 2^{11-7} = 5^1 \cdot 2^4 = 5 \cdot 16 = 80$$
Ответ: 80