$64^3:4^4$
$\lim_{x\to0}\left(\frac{\sqrt{1+7x}-\sqrt{1-3y}}{x}\right)$
$\left(-3x^4-4x^3-1\right)-\left(-x^4+4x^3+2x^2+x+1\right)$
$\lim_{x\to2}\:\left(x^2-5x-2\right)$
$s-d+z\:para\:s=-3$
$375\cdot189\:;\:45-493$
$3+\frac{x^2}{x}$
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