将线段AB延长至C,使BC=(1/3)AB,延长BC至D,使CD=(1/3)BC,延长CD至E,使DE=(1/3)CD,
问题描述:
将线段AB延长至C,使BC=(1/3)AB,延长BC至D,使CD=(1/3)BC,延长CD至E,使DE=(1/3)CD,
将线段AB延长至C,使BC=(1/3)AB,延长BC至D,使CD=(1/3)BC,延长CD至E,使DE=(1/3)CD,若AE=8cm,求AB的长
答
用个方程不久解决了设AB长为X那么BC就是1/3X,cd=1/3bc=1/3*1/3x,de=1/3cd=1/3*1/3*1/3x
x+1/3x+1/3*1/3x+1/3*1/3x*1/3x=8cm
解得X=27/5=5.4