a2=a1*q
1/5=(1/15)*q => q=1/5 :1/15 =3
a1=1/15
a2=(1/15) *3=1/5
a3=(1/5)*3=3/5 - это x
a4=(3/5) *3=9/5
...
a2=a1*q
1/5=(1/15)*q => q=1/5 :1/15 =3
a1=1/15
a2=(1/15) *3=1/5
a3=(1/5)*3=3/5 - это x
a4=(3/5) *3=9/5
...