$\:x^2\:+\:2xy\:+\:y^2\:,\:para\:x\:=\:5,\:y\:=\:-2\:$
$\frac{\left(-x^3-5x^2+3x+20\right)}{x^2+7x+12}$
$\:\left(\frac{4}{3}\right)\:a^2b^7\cdot\left(\frac{1}{2}\right)a^3$
$-4y\cdot y$
$x^8-9$
$\int\left(3+6y\right)\left(3y^2+3y+1\right)^2dy$
$-3x^2-9x+30$
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