$m^2+10m+9$
$16mn^2-20m^3n$
$\left(2-5y^2\right)\left(2+5y^2\right)$
$\lim_{x\to4}\left(\frac{5x^2+27x+28}{x+4}\right)$
$169-1.96$
$345\cdot\left(-93\right)+\left(\left(\left(56-578+235\right)+\frac{\left(-870\right)}{\left(-10\right)}\right)-\left(-5\right)\right)$
$\left(3y-3x\right)\left(3y+5\right)$
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