$\frac{4n^2}{2n^{.5}}$
$\left(7xy^3-2y\right)\left(7a^3+2abc\right)$
$\frac{\frac{1}{\sqrt{x+1}}}{x}-1$
$n\left(a+1\right)$
$4x^2+100x+999$
$\left(2a-3b^2\right)\left(4a^2+6ab^2+9b^4\right)$
$ab^2+ab^2+7ab^2+9ab^2+21b^2$
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