$\frac{2\sqrt{5}}{5\sqrt{2}}x\:\frac{-\sqrt{2}}{\sqrt{5}}x\:\frac{4}{3}x\frac{1}{2}$

$5x^2+2x+10$

$\lim_{x\to\sqrt{2}}\left(\frac{\left(\frac{1}{3x^2-2}-\frac{1}{4}\right)}{x-\sqrt{2}}\right)$

$16y^{2}-25$

$m^2-16+m^2+4m-21$

$7,3+2,15-1,025$

$\frac{1}{\sqrt{\left(x^2+1\right)}-1}\:$