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13.如图1.在平面直角坐标系中.有一张矩形纸片OABC.已知O.其中m为常数且m≥2.点P是OA边上的动点. 现将△PAB沿PB翻折.得到△PDB,再在OC边上选取适当的点E.将△POE沿PE翻折.得到△PFE.并使直线PD.PF重合..求y关于x的函数关系式.并求y的最大值,(2)当m=3时.若翻折后点D落在BC
8.等腰三角形ABC中.AB=CB.BO⊥AC.点P为射线BC上的动点.在射线CA上截取CD=CB.作PF⊥BD.分别交射线BO.BD于点E.F.设∠ABC=α.(1)令∠ABC=90°.①如图1.当点P与点C重合时.求证:△BOD≌△POE,②如图2.当点P在点C的左边时.求$\frac{BF}{PE}$的值,③猜想:当点P在点C的右边时.$\
Elizebeth T. PoeCPA (inactive), MBA "I have worked with John Lloyd for 15 years, and he has funded 30 to 40 loans for me. It's amazing how he has been able to help me close deals. Recently on a deal, I had to close in 10 days with no contingencies, and Fidelis was able to...