a1a2a36……a30
=a1^30*q^(1+2+……+29)
=a1^30*q^(15*29)=2^15,
a3a6……a30
=a1^10*q^(2+5+……+29)
=a1^10*q^(5*31),记为x,
x^3=a1^30*q^(15*31)
=2^15*q^30=2^30,
∴x=2^10,为所求.
a1a2a36……a30
=a1^30*q^(1+2+……+29)
=a1^30*q^(15*29)=2^15,
a3a6……a30
=a1^10*q^(2+5+……+29)
=a1^10*q^(5*31),记为x,
x^3=a1^30*q^(15*31)
=2^15*q^30=2^30,
∴x=2^10,为所求.