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An2005
a fost răspuns

Determinati element multimii A = { x € N | (x+2) dicizibil cu 5 , x = ab
Dau coroana la cine ma ajuta

Răspuns :

A={x∈N|(x+2)|5,x=ab}

x=13,18,23,28,33,38,43,48,53,58,63,68,73,78,83,88,93,98

A{13,18,23,28,33,38,43,48,53,58,63,68,73,78,83,88,93,98}

(x+2)|5=>x+2=10=>x=8 nu ne convine deoarece x are doua cifre
              x+2=15=>x=13
             x+2=20=>x=18
             ..................

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