$8787 \div 343 \times \sqrt{50} = ?$

If $a = \frac{\sqrt{5} + 1}{\sqrt{5} - 1}$ and $b = \frac{\sqrt{5} - 1}{\sqrt{5} + 1}$,then the value of $\frac{a^{2} + ab + b^{2}}{a^{2} - ab + b^{2}}$ is

What is the least number that can be added to the number $1020$ to make it a perfect square?

The value of $\frac{1+\sqrt{0.04}}{1-\sqrt{0.1}}$ is nearly equal to

$\sqrt{248+\sqrt{52+\sqrt{144}}} = ?$

$(x)^{2} \times (12)^{2} \div (48)^{2} = 81$,find the value of $x$.