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Stiind ca a+b = 349 si b+c=196 , calculati a+2b+c,apoi 2a+4b+2c


Răspuns :

a+b=369  ]
               ] => a+2b+c = 545
b+c=196  ]

si 2a+4b+2c = (a+2b+c) x 2 = 545 x 2 = 1090
a+b=349
   b+c=196
------------------+
a+ 2b+c=545
b)a+b=349
   a+b=349
      b+c=196
      b+c=196
---------------------+
2a+4b+2c=1090
sper ca te am ajutat