画线段AB=6cm,在AB上取一点P,使AP=BP,在AB的延长线上取一点C,使AC=3BC,在线段BA延长线上取一点D

问题描述:

画线段AB=6cm,在AB上取一点P,使AP=BP,在AB的延长线上取一点C,使AC=3BC,在线段BA延长线上取一点D
使AB=1/2AB求线段BC、DC的长度

应是AD=1/2AB吧
BC=1/2AB=3cm
DC=2AB =12cmDC=2AB =12cm 不对吧。D在左端,C在右端,DA=AB/2,BC=AB/2,再加AB,正好是2AB呀