$825-\left(-195\right)-170$
$-2x^2+x+3=0$
$\frac{k+1}{k}=1-\frac{k^2-3k-4}{4k}$
$-16-3-6+3+6+2-6+2-5-1$
$\lim_{x\to3}\left(\frac{x^2}{e^x}\right)$
$4-\left(-12:4+\left(4-\left(4:-2+12-2\right)-6\right)\right)$
$\left(-552\right)\cdot24$
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