$81x^2-12x+36y^2$
$-\frac{3}{2}m^2n;\:m=2;\:n=-7$
$1^{13}$
$\left(3x^7y^3\right)\left(4x^4\cdot y^{-5}\right)$
$20x^2-20x+25$
$\left(x+5\right)^2+x^2-10x+25$
$5x\:-\:1\:<\:10$
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