已知线段AB=acm,点A1平分AB,A2平分A A1,A3平分A A2,...,An平分A AN-1,则A An=多少cm?

问题描述:

已知线段AB=acm,点A1平分AB,A2平分A A1,A3平分A A2,...,An平分A AN-1,则A An=多少cm?
麻烦画个草图,我这不方便发图.

a/(2^n) cm
不难看出AA1为a/2 cm
AA1为a/2² cm
AA3为2的立方分之a cm
由此递推AAn等于2的n次方分之a cm