已知线段AB=acm,点A1平分AB,A2平分AA1,A3平分AA2,.,An平分AAn-1,则AAn等于多少厘米?
问题描述:
已知线段AB=acm,点A1平分AB,A2平分AA1,A3平分AA2,.,An平分AAn-1,则AAn等于多少厘米?
答
数学归纳法:AA1=a/2^1,AA2=a/(2^2),AA3=a/(2^3),
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所以:AAn=a/(2^n)即:AAn=a/(2的n次方)