$8+7-11.1-2.8+6-17-9$
$\sqrt{3^2}\:\cdot5^3$
$f\left(x\right)=\frac{x}{\sqrt{x}^4+4}$
$-11w^2-1^2$
$25x^2y^4+30x^3y^3$
$5n-13u-11n-8u$
$\frac{x^{2}-8x+15}{x^{2}-9}$
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