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

Răspuns :

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

100+200+300=600