$r^3+8s^3$
$100x^2-9y^2$
$\left(x+4\right)y'=6y$
$2x^2+5x+3\cdot3x^2-2x+4$
$x^2-9x+14$
$\lim_{t\to9}\left(\frac{9+t}{3-\sqrt{t}}\right)$
$278.34\cdot2.2$
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