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sa se afle numerele a,b,c,stiind ca a+b=3000,b+c+5000,iar a+c=4000

Răspuns :

c=a+2000
b=a+1000
3000-1000=2000
2000:2=1000(a)
1000+2000=3000(c)
1000+1000=2000(b)