$832.58 - 242.31 = 779.84 - ?$

Simplify: $2 \div [2 + 2 \div \{2 + 2 \div (2 + 2 \div 3)\}]$

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

What is the value of $4^{3}-3^{2}+6^{2}-5^{2}+8^{2}-7^{2} ?$

If $x = \frac{4 \sqrt{ab}}{\sqrt{a} + \sqrt{b}}$,then what is the value of $\frac{x + 2 \sqrt{a}}{x - 2 \sqrt{a}} + \frac{x + 2 \sqrt{b}}{x - 2 \sqrt{b}}$ (when $a \neq b$)?

What will come in the place of the question mark $(?)$ in the following expression?
$43931.03 \div 2111.02 \times 401.04 = ?$