$\frac{n\left(3+n\right)}{2}=40$
$\frac{2x^2+14x+24}{2x+4}$
$\lim_{x\to0}\frac{\sqrt{5x^2+x^4}}{x}$
$10cm\cdot\frac{4}{5}$
$b^2+54+288$
$\left(10\sqrt[2]{5}\right)^2$
$\left(\frac{1}{2}x+3y^2\right)$
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