Răspunsuri

2014-10-03T11:09:50+03:00
a+b+c=18    - 1
2a+b+2c=25
  - 2
 rel. 2 - rel. 1      2a+b+2c-a-b-c=25-18        a+c=7
(a+c)*(3a+2b+3c)=(a+c)*[(2a+b+2c)+(a+b+c)]=7 * (25+18)=7 * 43=301



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