$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:2,5\left(5\right)-1,5\:$
$2x^3-6x$
$\left(4a+5b^2\right)\left(4a-5b^2\right)$
$324x^2-216x+36$
$\frac{az}{ax}\left(z^2+x^2-zy+zx=3\right)$
$2\sqrt{12}$
$y^2-1+2y^2$
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