$18abc+20ab-12a$
$\left(\frac{\sqrt{x+y}}{\sqrt{x}}\right)$
$\frac{a^2-100b^2}{a+10b}$
$\int x^5e^xdt$
$3\left(-1\right)^2-5\left(-1\right)-1$
$\left(x^2-x+3\right)\left(3y^2+6y+1\right)$
$\frac{8.6^2}{4}\cdot\sqrt{3}$
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