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Suma a sase nr pare consecutive este 642. Aflati nr.

Răspuns :

x+x+2+x+4+x+6+x+8+x+10=642
6x+30=642
6x=642-30
6x=612
x=612:6
x=102
a+a+2+a+4+a+6+a+8+a+10=642
6a=642-30
a=612:6
a=102
nr sunt: 102,104,106,108,110,112