$\left(4a-2b-5c\right)^2$
$80,955+1$
$9-\left(2+\left(-7\right)\right)$
$21y^2-54y+24$
$x^2-15x+2$
$\sqrt{3}\cdot\left(\sqrt{60}+\sqrt{21}\right)-6\sqrt{5}$
$\lim_{x\to-2}\left(\frac{x^2+4}{x+2}\right)$
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