$\frac{x^2\cdot y^3}{x^4\cdot y^2}$
$\sqrt{x-3=4}$
$-30x-1$
$-220+250-200+330+170+140-160$
$498^2$
$\left(3ab-7x\right)^2$
$6b^2+72b+210$
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