Cube and Cube Roots

The cube root of 0.001728 is:
Find the smallest number by which each of the number must be multiplied to obtain a perfect cube:- 8192
Simplify $$\displaystyle \sqrt[3]{\frac{1}{8}\times \frac{125}{64}}$$
solve: $$\left[x + \dfrac{1}{x}\right]^3$$
$$\sqrt[3]{-2,744} \div \sqrt[3]{0.008}$$ = ...........