$\left(-81\right):\left(+9\right)$
$\frac{2a^4b^2}{7a^3b^2}$
$\lim_{x\to\infty}\left(\frac{e^{2x}}{\sqrt{\left(3e^{4x}-e^{-1}\right)}}\right)$
$-6\left(5+x\right)+\left(13x+1\right)$
$-x^2-2<2x-1$
$\left(\frac{5x^2y^3z^{-3}}{3x^5y^{-2}z^3}\right)^{-3}$
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