$\lim_{x\to0}\left(\frac{\sqrt{2x+3}-x}{x^2-9}\right)$
$5x^2-320$
$\left(\frac{-4x^2}{2x}\right)^3$
$\frac{-3x+12>0}{x+1>0}$
$\frac{d}{dx}\frac{-x^{\frac{1}{3}}}{y^{\frac{1}{3}}}$
$1111\cdot2552$
$-7+-16+2$
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