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2014-10-04T20:02:45+03:00
A·(b+c+d)=7·70=490 este raspunsul
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2014-10-04T20:07:57+03:00
a=7, b+c+d=70 rezolvati ab+ac+ad=?
ab+ac+ad=a(b+c+d)
=>ab+ac+ad=7*70
=>ab+ac+ad=490