已知线段AB=acm,A1平分AB,A2平分AA1,A3平分AA2,…,An平分AAn-1,则AAn=_cm.

问题描述:

已知线段AB=acm,A1平分AB,A2平分AA1,A3平分AA2,…,An平分AAn-1,则AAn=______cm.

∵线段AB=acm,A1平分AB,A2平分AA1,A3平分AA2
∴AA1=

1
2
a,AA2=
1
4
a,AAn=(
1
2
na.
故答案为(
1
2
na.