$78.5+39.64+5$
$\lim_{x\to1}\left(2^{x-1}\right)$
$\frac{dy}{dx}+\frac{1}{x}y=\frac{2}{3}x^2y^2$
$\sqrt{864a^5b}^4$
$8r+38r$
$4x^2+3x-7$
$49x^2-9x+4$
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