$6.5\cdot10^7$
$\int\left(\frac{x}{\sqrt{x^2+12}}\right)dx$
$3a^2-4a^2b+3ab^2-b^3;\:a=-1;\:b=2$
$9a^4-81b^2$
$\left(\frac{2x}{5}\:-\:\frac{25}{4}\right)^2$
$\left(x^2y-2z\right)^2$
$\frac{d}{dx}\sqrt{xy}+\:2y=\sqrt{x}$
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