$\frac{2x^2+11x+17}{x+4}$
$3x^2\le-343$
$-124x^7y^2z^8\:entre\:-4x^3z^3$
$\left(\frac{9}{2}-\frac{2}{9}\right)^4$
$\lim_{x\to\infty}\left(\frac{e^{-2}}{1+e^{-x}}\right)$
$\left(\frac{2}{3}x^3y^3\right)dy+\left(\frac{1}{2}x^2y^4\right)dx=0$
$-7x^2-28x-28$
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