若am=8,an=1/2,则a2m-3n=_.
问题描述:
若am=8,an=
,则a2m-3n=______. 1 2
答
∵am=8,an=
,1 2
∴a2m-3n=(am)2÷(xn)3,
=82÷(
)3,1 2
=512.
故填512.