$2\cdot2^5+4\cdot2^4-6\cdot2^3+8\cdot2^2+10\cdot2-20$
$m^8+18m^4n^2+81n^4$
$\frac{x^2-4}{x^2-2x}$
$-\frac{4}{5}\cdot\left(-\frac{5}{4}\right)$
$\left(3^2\right)^2\cdot3^2$
$\frac{7}{4x-4}$
$\frac{\left(\sen\beta+\cos\beta}{\left(\sec x+\tan gx\right)^{2}-1}$
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