As shown in the Fig.3, Band Care points on AD in △AED. AB=CD, EB=EC=10, BC=12. The perimeter of △AED is twice the perimeter of △EBC. Then S△AED/S△EBC=____.(S△AED respresents the area of △AED ,S△EBC respresents the area △EBC) (英汉小词典:perimeter周长;area面积)