$\lim_{x\to9}\left(\frac{x^2-81}{3x-27}\right)$
$\lim\:_{x\to\:\infty\:}\left(\frac{x^2-2x+3}{x-1}+ax+b\right)$
$x^5-2x^2+x$
$\frac{2s+5}{\left(s+3\right)^2+25}$
$6a^2\cdot6$
$\frac{3x^{7}y}{27x^{7}y^{7}}$
$4\left(a+b^2\right)-12\left(a+b\right)+9$
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