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afla numerele a,b,c,stiind ca a+b=300,b+c=500,iar a+c=400


Răspuns :

a+b+b+c+a+c=1200 2a+2b+2c=1200/:2 a+b+c=600 c=600-300=300 b=600-400=200 a=600-500=100