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Determimati elementele multimii A={x€N|63/(2x+1) €N}

Răspuns :

multimea divizorilor lui 63={1,3,7,9,63}

2x+1=1, x=0
2x+1=3, x=2
2x+1=7, x=3
2x+1=9, x=4
2x+1=63, x=31
2x+1=1, x=02x+1=3, x=22x+1=7, x=32x+1=9, x=4