Question

3 √90 - √250 - √10.

Answer 1

$3 \sqrt{90} - \sqrt{250} - \sqrt{10} \\ \\ 3 \sqrt{2.3^2.5} - \sqrt{2.5^3} - \sqrt{10} \\ \\ 3.3 \sqrt{10} - 5 \sqrt{10} - \sqrt{10} \\ \\ \\ 9 \sqrt{10} - 5 \sqrt{10} - \sqrt{10} \\ \\ 9 \sqrt{10} - 6 \sqrt{10} \\ \\ =\ \textgreater \ 3 \sqrt{10}$