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iceghost

$a)$ĐKXĐ $: x \ne -1$
$b)\dfrac{2x^2+4x+2}{x^3+1} \\
=\dfrac{2(x^2+2x+1)}{(x+1)(x^2-x+1)} \\
=\dfrac{2(x+1)^2}{(x+1)(x^2-x+1)} \\
=\dfrac{2(x+1)}{x^2-x+1}$
 
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