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Mari98898
a fost răspuns

Se stie ca: ab+ac+ad=2005
si b+c+d=401,aflati ,,a''

Răspuns :

ValyRemus
[tex]ab+ac+ad=2005\\\\a\cdot(b+c+d)=2005\\\\401\cdot a=2005\\\\a=\boxed{\boxed{5}}[/tex]
Sapphire1234
Dai factor comun pe a:
ab+ac+ad = a*(b+c+d) 
=> a=2005/(b+c+d)
a=2005/401
a=5
:D