如图所示,点C分线段AB为AC:BC=5:7,点D分线段AB为AD:BD=5:11.若CD=10cm,求AB的长.
问题描述:
如图所示,点C分线段AB为AC:BC=5:7,点D分线段AB为AD:BD=5:11.若CD=10cm,求AB的长.
A___________D____C_________________B
答
∵AC=5/12AB
AD=5/16AB
∴CD=(5/12-5/16)AB=5/48AB
∴AB=96cm