$-2^{2}a^{2}b\left(-9ab^{2}\right)$
$\frac{5x^2-3x-2}{x^2-1}$
$\sqrt{x^2+w^2};\:x=3;\:y=-4$
$3y^{-4}\cdot\:2x^3y^{-4}$
$b^44-\frac{2}{25}a^2b^2$
$a-2a+3a$
$\left(2a^2b\right)\left(6ab^{-3}\right)\left(5a^{-2}b\right)$
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