$f^2+5f+4$
$2y^2+y$
$2x\left(x+2\right)^{-\frac{1}{2}}+\left(x+2\right)^{\frac{1}{2}}$
$3x^2\:entre\:3$
$\left(x^2y^3+11x^4y^5\right)^3$
$\left(5g-2g^4\right)+\left(9g+7g^4+6\right)$
$\left(\frac{1}{x^2}2x\right)^5$
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