$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$

Direction: what should come in place at question mark(?).

$$ {4\over 7}×{2{4\over 5}÷{2\over 5}=?}$$

Evaluate: $$ {9।3-5।-5।-5।4।÷10\over-3(5)-2×4÷2}$$

The sum of the squares of 2 number is 146 and the square root of one of them is 5. The cube of the other number is 

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

Simplify : $$ {(2x)^{2}-(2y)^{2}-(4x)^{2}}$$

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

By what least number should 4320 be multiplied so as to obtain a number which is perfect cube?