Răspuns :
a
a+1
a+2
a+3
a+a+3=613
2a=610
a=305
a+1=305+1=306
a+2=305+2=307
a+3=305+3=308
a+1
a+2
a+3
a+a+3=613
2a=610
a=305
a+1=305+1=306
a+2=305+2=307
a+3=305+3=308
a+(a+1)+(a+2)+(a+3)=,
a+a+3=613,
613-3=610,
2×a=610,
a=610÷2,
a=305,
a+1=305+1=306,
a+2=305+2=307,
a+3=305+3=308.