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a+b=30
{A,b} p.d {3,5}

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Răspuns :

{a,b} d.p. {3,5}=>a/3=b/5=>a=3b/5
a+b=30=>3b/5+b=30=>8b/5=30/x5=>8b=150/:8=>b=18,75=>a=11,25