$\left(9^{-n}\cdot9\right)^3$
$100\cdot0,8^{\infty}$
$14x^4y^5\left(-13xy^3\right)$
$-\frac{\pi}{6}+\frac{3\pi}{2}$
$\frac{63x^6y^2z^3}{81x^5y^4z^3}$
$\left(7xy^2+5a^3\right)\left(7xy^2-5a^3\right)$
$57^2$
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