题目内容：

梯形的梯子AA'‖EE',AB=BC=CD=DE,A'B'=B'C'=C'D'=D'E',AA'=0.5m,EE'=0.8m,求BB',CC',DD'的长

优质解答

bb'=0.575m
cc'=0.65m
dd'=0.725m
cc'是梯形aa'e'e中位线
cc'=(0.5+0.8)/2=0.65
bb'是梯形aa'c'c中位线
bb'=(0.5+0.65)/2=0.575
dd'是梯形cc'e'e中位线
dd'=(0.65+0.8)/2=0.725