$\frac{x^2}{x^2-4}-\frac{x+1}{x+2}$
$4x^2+8x+1$
$a^2-a+30$
$\left(\left(\frac{\sqrt[2]{x}}{y^{\frac{3}{2}}}\right)^{-2}\right)^3\left(\frac{x^{\frac{3}{2}}}{y^3}\right)^{-1}=\left(\frac{x^{-1}}{y^{-3}}\right)^3\left(\frac{x^{-\frac{3}{2}}}{y^{-3}}\right)$
$\left(a^{-3}+a\right)\left(a^{-3}+7a\right)$
$4.\left(13.8\right)+3\cdot\left(9\cdot15\right)$
$\lim_{x\to\infty}\left(\frac{e^x+x}{e^x+x^2}\right)$
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