$\frac{8}{10}x^2-\frac{1}{5}x^2$
$m\left(2x+1\right)=x+4$
$\sqrt{20}^2$
$\sqrt{a^2b}.\sqrt[4]{abc}$
$\left(3+\frac{x}{2}\right)^2$
$2b^2-8b^4$
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