If $$ {3\sqrt{{1-a}\over{a}}}+9={19-3\sqrt{{a}\over{1-a}}}$$, then what is the value of a?

1-[5-{2+(-5+6-2)2}] is equal to 

The value of $$ {\sqrt{0.6912}+{\sqrt{0.5292}}\over {\sqrt{0.6912}-{\sqrt{0.5292}}}}$$ is:

3x² = 36 then what is the value of x?

If  $$\sqrt{2}=1.414$$, the value of $${ \sqrt{2}-1\over\sqrt{2}+1}$$  is nearest to 

If the average of 11, 23 and x is 40, then what is the value of x?

The largest number of five digits, which is a perfect square is 

The value of x in the given equation
$$ {23 ^2 + \sqrt{x}=625}$$