$9ab-12bc+30b^2$
$x^3-3x^2+x+2$
$\int\frac{10}{\left(x-4\right)^2\left(x-1\right)}dx$
$f\left(x\right)=\sqrt{\left(\frac{2x-3}{x+1}+1\right)}$
$\lim_{x\to\infty}\left(\frac{x^2}{lnx}\right)$
$-15\:.\:8\:-\:\left(-\:128\:+\:256\right)\::\:\left(-\:7\:+\:3\right)\:+\:\left(-\:135\:+\:128\right)\:.\:3\:$
$f.4x-17\:=3x-24\:$
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