$\sqrt[4]{-9}\cdot\sqrt[4]{9}\cdot\sqrt[4]{-1}$
$28,88+15,15$
$\left(5b-9c\right)\left(5b+9c\right)$
$\left(6+4\right)\left(8-2\right)$
$x^2-4x>-3$
$7\left(-4y^4\right)$
$x^2-3^3+2ax-4$
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