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Determinati elementele multimii

Determinati Elementele Multimii class=

Răspuns :

7/(2x+1) ∈Z, x∈Z

=>2x+1 divide 7; 2x+1∈D7

2x+1∈{-7,-1,1,7} ∩Z

x∈{-4,-1, 0, 3}

A={-4, -1, 1, 3}