Question

Determinati elementele A={x€Z|7 supra 2x+1 € Z}.

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Answer 1

Divizorii lui 7 in Z sunt 1,-1,7,-7
2x+1=1=>x=0
2x+1=-1=>x=-1
2x+1=7=>x=3
2x+1=-7=>x=-4
Elementele mulțimii A={-4,-1,0,3}