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suma a 3 nr consecutive este 519.afla nr

Răspuns :

Fie a,b,c cele trei numere.


a+b+c=519

b=a+1
c=a+2
a+a+1+a+2=519
3a+3=519
3a=519-3
3a=516
a=172
b=172+1
b=173
c=172+2
c=174
x+x+1+x+2=519
3x=519-3
3x=516
X=516:3
X=172
X+1=173
X+2=174