Answer
$$806, 400$$
Work Step by Step
We know that $n!=n\cdot(n-1)\cdot (n-2)\cdot 3\cdot2\cdot 1$
Use this definition to obtain:
$$\require{cancel} \displaystyle \frac{5! \cdot 8!}{3!} =\frac{(5 \cdot 4\cdot 3\cdot 2 \cdot 1 ) \cdot (8 \cdot 7 \cdot6\cdot5\cdot 4\cdot \cancel{3!})}{\cancel{3!}}\\
=(5 \cdot 4\cdot 3\cdot 2 \cdot 1 ) \cdot (8 \cdot 7 \cdot6\cdot5\cdot 4) \\
=806, 400$$
