$x^2-x+2>0$
$2x+5\cdot2x-5-2x-1^2$
$\left(x^{a-1}-x^{a-2}\right)^3$
$4x^2-100$
$\left(3^{15}\cdot3\right)$
$\lim_{x\to0}\left(\frac{36x^2-3x-8}{12x^2-8x+8}\right)$
$\left(-12\right)^1$
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