$\sqrt{144}+2\cdot3^2$
$3^x-3^{x-1}-3^{x-2}=15$
$\int_0^{\infty}\left(\frac{x^3}{e^{x-1}}\right)dx$
$x^4+4x^2-21$
$0,35-0,09$
$am\cdot am+1$
$3\sqrt{10}\cdot\:3\sqrt{2}$
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