$\frac{x^2-14x-51}{x^2-4x-21}$
$\sqrt{2c}.\sqrt{11c}$
$.18+7$
$\left(\frac{3}{4}x^2y^4\right)por\left(-\frac{5}{4}x^5yz\right)$
$\frac{6x^5+5x^4+x^2-2}{x^2+1}$
$x^3+3x^2+x^4$
$\left(2x-3xy\right)^2$
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