$3mn^2\left(-5m+4n\right)$
$\lim_{x\to-1}\left(5x^2+7x+2\right)$
$-\frac{1}{2}x^{-2}$
$12.26\cdot8.7$
$\sqrt[2]{5}-\sqrt[2]{3}=\sqrt[2]{x}-\sqrt[2]{y}$
$x^5-9x^4+33x^3-61x^2+56x-20$
$x^2+2x>15$
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