Răspunsuri

  • Utilizator Brainly
2014-09-03T13:25:39+03:00
A+3b+2c=?

a+b=7
b+c=10  /*2 inmultim relatia cu 2 si obtinem ⇒
2b+2c=20


a+b=7
2b+2c=20  adunam cele doua relatii 
a+3b+2c=27


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