$\lim_{x\to1}\left(\frac{x-1}{1-\sqrt{2-x}}\right)$
$\frac{2}{x-2}-\frac{1}{x+2}=\frac{3}{x^2-4}$
$37.8-10.8$
$\left(2+3x^2+x^3\right)\cdot\left(x^2-1+4x\right)$
$\frac{-15a^7b^3}{+5ab}$
$x^2-22-484$
$\left(\frac{3x^2-5y}{3}\right)^2$
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