$\frac{2^{-3}}{3^0}$
$\left(9m-n\right)^2$
$-20a^8\cdot5a^7$
$\frac{dt}{dx}=\left(2-t\right)\left(1-t\right)$
$\sqrt{x}+\sqrt{2x}$
$9a^4-49b^6$
$\left(\frac{2}{3}a+\frac{5}{4}b\right)^{2}$
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