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Determinati elementele multimii A={x∈Z|[tex] \frac{-6}{x-1} [/tex] ∈Z}
Repede va rog


Răspuns :

(-6)/x-1∈Z <=> x-1|-6
=> x-1∈{-6:-3:-2:-1:1:2:3:6}
=> x∈{-5:-2:-1:0:2:3:4:6}


[tex]\it \dfrac{-6}{x-1} \in \mathbb{Z} \Rightarrow x-1\in D_{-6} \Rightarrow x-1\in\{-6, -3, -2, -1, 1, 2, 3, 6\}|_{+1} \\\;\\ \\\;\\ x\in\{-5,\ -2,\ -1,\ 0,\ 2,\ 3,\ 4,\ 7\}[/tex]