$\left(4a-2b-5c\right)^2$
$2yx^4\:x\:3x^{-4}y^3$
$2x+2y+4y$
$1.2\cdot10^4$
$x\left(x\:+1\right)\left(x\:-\:1\right),\:si\:x\:=\:-3$
$m-9=4$
$\lim_{x\to\infty}\frac{x\left(\sqrt{x^2-1}-x-1\right)}{x+1}$
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