$1-a-1$
$\frac{279268.25}{566.35}$
$x^2-20x-44$
$\sqrt{400}+39-9^2-24$
$4x^2-4x+16a$
$\left(6\cdot50\right)+\left(6\cdot2\right)$
$\left(a^m-3a^m+5a^{m-3}\right)\left(a^2-5\right)$
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