$3\sqrt{10}-\frac{\sqrt{21}}{4}-3.61$
$x^2\:+5x-7\:\:\:\:si\:x=-1$
$f^2-16f+24$
$x^2+y^2+y''=36+x+y''$
$\frac{3.6742}{9}$
$256w^{14}y^2-16y^4$
$27\cdot27\cdot27$
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