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2014-11-13T09:56:17+02:00
A×b=56 a+b=? a+b=? a×b=56 =>a=7 b=8 =>a+b=7+8=15
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2014-11-13T10:10:48+02:00
Ax(a+1)=56  a+b=?   deci a=7;b=8  suma 7+8=15
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