线段AB,在AB延长线上取点C,使BC=2AB,M是AC中点,若AB=30,求BM长kkkkkkkkkkkkk现在立刻马上要

问题描述:

线段AB,在AB延长线上取点C,使BC=2AB,M是AC中点,若AB=30,求BM长
kkkkkkkkkkkkk现在立刻马上要

可以画图,
AB+BC=3AB=3*30=90
90*1/2=45
BM=AM-AB=45-30=15