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.
答
∵线段AB=acm,A1平分AB,A2平分AA1,A3平分AA2,
∴AA1=
a,AA2=1 2
a,AAn=(1 4
)na.1 2
故答案为(
)na.1 2