Răspuns :
a si b=a+1
a+(a+1)=1381
2a=1381-1
a=1380:2
a=690
b=a+1=691
a=690, b=691
verificare
a+b=1381
690+691=1381
1381=1381
a+(a+1)=1381
2a=1381-1
a=1380:2
a=690
b=a+1=691
a=690, b=691
verificare
a+b=1381
690+691=1381
1381=1381