$337.62 + 8.591 + 34.4 = ?$

If $3x + \frac{3}{x} = 1$,then $x^{3} + \frac{1}{x^{3}} + 1$ is

The value of $\frac{(2.3)^{3}-0.027}{(2.3)^{2}+0.69+0.09}$ is

What value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)
$21 + 39 \times 2.9 + 8.99 = ?$

What is the smallest value that must be added to $708$ so that the resultant is a perfect square?

If the numbers $\sqrt[3]{9}, \sqrt[4]{20}, \sqrt[6]{25}$ are arranged in ascending order,then the correct arrangement is: