$p^2-20p+100$
$\sqrt{0.81\cdot a^5\cdot b^3}$
$\left|24\right|-\left|5-8\right|$
$7x+30\ge-8$
$-4+23-\left[5+2\left(5-4\right)-\left(2-5\right)\right]$
$25-4y^2$
$1-2\cdot\left(\frac{2^4}{5}\right)^{-1}\cdot\frac{2^3}{5}$
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