$\frac{x}{3-x}\ge27$
$2\:\frac{5}{4}\:.\:3\:\frac{4}{6}$
$m^2+2mn$
$x+4+3x$
$\frac{x}{5}-5\ge2$
$\frac{dy}{dx}\left(y=\frac{2x^4}{b^2-x^2}\right)$
$8\:.\:9\:-\:2\:.\:5$
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