1. Given a rectangular parallelepiped with sides 6.6 and $x$. For what values of the number $x$ is the product of the surface area and the perimeter (the sum of the lengths of all edges) of this parallelepiped not greater than $224 / 3$ of its volume?
Write the answer in the form of an interval.

Answer: $[4 ; 9] \|[4,9]$