$\lim_{x\to\infty}\left(\frac{2x^2-3x+5}{2x^2+3x+1}\right)^{6x+5}$
$x^2+8x+3\ge12x+24$
$2x^2y+4x^2y^2+6xy^3$
$z^2-16z+256$
$\frac{16}{2x}$
$\lim_{x\to0}\left(\frac{tanx-3x}{x-sin3x}\right)$
$10n^2+100n+250$
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