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Stiind ca a+b+c=13 calculeaza
1000-(25a+25b+25c)


Răspuns :

1000-[25(a+b+c)]
1000-[25*13]
1000-325
675
a+b+c=13
1000-(25a+25b+25c)=
1000-25*(a+b+c)=
1000-25*13=
1000-325=675