$2,5xy+1,5xy-3xy$
$\frac{2x-3}{x-2}\ge3$
$\lim_{x\to1}\left(\frac{x^2-1}{\sqrt{x^2-x+4}-2}\right)$
$24-1.9$
$9x^2-36x-36$
$\left(7g-4z\right)^2$
$\left(x+1\right)^3-3\left(x+1\right)^2\left(y\right)+3\left(x+1\right)\left(y\right)^2-\left(y\right)^3$
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