Răspuns :
Mai intai calculam ratia:
[tex]a_5=a_1+4r\\5=1+4r\\4r=4\\\boxed{r=1}\\a_{2018}=a_1+2017r=1+2017=2018[/tex]
a1=1 ; a5=13 ; calculam ratia = r ; a5 = a1+4r ; 13 = 1+4r ; 4r = 12, r = 12/4 = 3
a2018 = a1+2017*r = 1+2017*3 = 1+6051 = 6052
Mai intai calculam ratia:
[tex]a_5=a_1+4r\\5=1+4r\\4r=4\\\boxed{r=1}\\a_{2018}=a_1+2017r=1+2017=2018[/tex]
a1=1 ; a5=13 ; calculam ratia = r ; a5 = a1+4r ; 13 = 1+4r ; 4r = 12, r = 12/4 = 3
a2018 = a1+2017*r = 1+2017*3 = 1+6051 = 6052