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2014-11-06T08:20:10+02:00
Cel mai inteligent răspuns!
2014-11-06T08:20:46+02:00
A+b+c+d=54
a+a+1+a+2+a+3=54
4a=54-6
4a=48
a=48:4
a=12
b=a+1=13
c=a+2=14
d=a+3=15
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