Răspunsuri

  • Utilizator Brainly
2014-09-14T15:22:57+03:00
2a+b=5 / *2
2b+3c=7 / *3
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4a+2b+ /  =10
  /  6b+9c= 21  adunam relatiile si rezulta 
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4a+8b+9c=31