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Afla numerele a,b si c stiind ca :a+b=300,b+c=500,a+c=400.

Răspuns :

[tex]a+b+b+c+a+c=300+500+400 \\ 2(a+b+c)=1200 \\ a+b+c=1200:2=600 \\ c=600-300=300 \\ a=600-500=100 \\ b=600-400=200[/tex]