点C是线段AB的黄金分割点,且AB=20cm,则BC的长为
人气：167 ℃ 时间：2020-04-10 13:21:22
解答
黄金分割是 (√5-1)/2
所以BC=AB*(√5-1)/2=10√5-10cm
或BC=AB[1-(√5-1)/2]=30-10√5cm
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