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Suma a cinci numere pare consecutive este 260

Răspuns :

a +(a+1)+(a+2)+(a+3)+(a+4)=260
5a+10=260
5a=260-10
5a=250
a=250:5
a=50
a+1=50+1=51
a+2=50+2=52
a+3=50+3=53
a+4=50+4=54