$k^2+11k^2+30$
$1x\cdot143yz$
$\left(5x^2+3xy-2y\right)\left(\frac{1}{3}x+\frac{1}{2}y\right)$
$-27.2-3.55$
$\int\frac{4x^3}{x^4+4}dx$
$\lim_{n\to\infty}\left(\frac{3^n\cdot n+3^n-n-1}{3^{n+1}-1}\right)$
$4^{-3}\cdot5^2$
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