Question

Sa se aflee numerele a,b si c ,stiind ca a+b=3000,b+c=5000,iara+c=4000

Answer 1

a+b+b+c+c+a=3000+5000+4000
2a+2b+2c=12000
2(a+b+c)=12000
a+b+c=12000:2
a+b+c=6000
a+b=3000
3000+c=6000
c=6000-3000
c=3000
a+c=4000
a+3000=4000
a=4000+3000
a=1000
1000+b=3000
b=3000-1000
b=2000
Verificare: 1000+2000+3000=6000