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2014-09-26T21:36:31+03:00
Ab+ac=42, a(b+c) =42, a=42:21, a=2, ab+ac+a=176, a(b+C+1)=176, a*11=176, a=176:11, a=16
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2014-09-26T21:50:17+03:00
Ab+ac= a· ( b+c) = 42  
b+c =21                       ⇒ a·21=42 | :21
                                         a= 2  
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