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Popamadalina121
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enumerati elementele multimii A={x/x∈Z-{-1},3x+2/x+1 ∈Z}

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[tex]x=?\,\in\,Z\,\,astfel\,\,ca\,\;\frac{3x+2}{x+1}\in\;Z\\ \frac{3x+2}{x+1}=\frac{3x+3-1}{x+1}=\underbrace{\frac{3(x+1)}{x+1}}_{\;\in\,Z}\;-\underbrace{\frac{1}{x+1}}_{\in\;Z\;daca\;x=\{-2\,;\;0\}\;.[/tex]

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