$-\frac{25}{12}mn^2+\frac{5}{3}mn^2$
$\lim_{n\to1}\left(\frac{\ln\left(n+1\right)}{n}\right)$
$\frac{3x^2+15x-18}{3x-3}$
$\left(\frac{1}{2}\right)^{-6}$
$\frac{8x^{-2}z}{9xy^{-3}z^{-2}}$
$\int_1^{\infty}\left(\frac{1}{\sqrt{x^2-0.1}}\right)dx$
$5x-4\ge2x+2$
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