$\lim_{x\to0}\left(\frac{x^2+7x}{x+e^x}\right)$
$\left(4-z^2\right)\left(z^3\:-3z+1\right)$
$9.\sqrt{2}-3.\sqrt{2}$
$2xy^2+9x^2y-x^2y+3xy^2-6x^2y-5xy^2$
$\lim_{x\to2}\left(\frac{x^4-4x^3+5x^2-4x+4}{x^3-2x^2-4x+8}\right)$
$\left(m^4\right)^{10}$
$\left(2v\:+\:8v^2\right)\:-\:\left(-4v\:-\:2v^2\right)$
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