$45.\left(-30\right)$
$\left|50\right|\cdot\left|-20\right|$
$\frac{4x^3-x}{2x+3}$
$\left|\left(-4\right)\left(-2\right)^2+8\right|$
$\left(\frac{1}{2}x-\frac{2}{5}y\right)^2$
$\frac{2^2-4}{\sqrt{2}^2-3-1}$
$1w$
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