$-10m+25m^2+m^2$
$2x^4-x^3-3x^2$
$25x^2+80xy+9x^2$
$3z^2+21$
$\left(4a^2z\right)^2$
$3a^2;\:a=1,7$
$2\sqrt{8x^5y^2}-xy\sqrt{18x^3}$
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