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Suma a3 nr consecutive este 306

Răspuns :

a+a+1+a+2=306
3a+3=306
3a=303
a=303:3
a=101
b=101+1=102
c=101+2=103
a+b+c=306
306-1-2=303
303:3=101 (a)
101+1=102(b)
102+1=103(c)