$\int\frac{x}{\left(x^2-4x\:-5\right)}dx$
$2,4\:por\:100$
$\frac{b^9-1}{b+1}$
$\sqrt{50}\cdot\sqrt{72}$
$0.03+\left(0.03\right)^2$
$-4\left(v+1\right)+1$
$\left(xy\:+\:1\:+\:2x\:e\:xy\right)\:$
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