若am=8,an=1/2,则a2m-3n=_.

问题描述:

若am=8,an=

1
2
,则a2m-3n=______.

∵am=8,an=

1
2

∴a2m-3n=(am2÷(xn3
=82÷(
1
2
3
=512.
故填512.