如圖.在矩形ABCD中.AB=3,AD=1,點(diǎn)P在線段AB上運(yùn)動(dòng).設(shè)AP=.現(xiàn)將紙片折疊.使點(diǎn)D與點(diǎn)P重合.得折痕EF(點(diǎn)E.F為折痕與矩形邊的交點(diǎn)).再將紙片還原. (1)當(dāng)時(shí).折痕EF的長(zhǎng)為,當(dāng)點(diǎn)E與點(diǎn)A重合時(shí).折痕EF的長(zhǎng)為, (2)請(qǐng)寫出使四邊形EPFD為菱形的的取值范圍.并求出當(dāng)時(shí)菱形的邊長(zhǎng), (3)令.當(dāng)點(diǎn)E在AD.點(diǎn)F在BC上時(shí).寫出與的函數(shù)關(guān)系式.當(dāng)取最大值時(shí).判斷與是否相似?若相似.求出的值,若不相似.請(qǐng)說(shuō)明理由. 溫馨提示:用草稿紙折折看.或許對(duì)你有所幫助哦! 查看更多

 

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(2009•義烏)如圖,在矩形ABCD中,AB=3,AD=1,點(diǎn)P在線段AB上運(yùn)動(dòng),設(shè)AP=x,現(xiàn)將紙片折疊,使點(diǎn)D與點(diǎn)P重合,得折痕EF(點(diǎn)E、F為折痕與矩形邊的交點(diǎn)),再將紙片還原.
(1)當(dāng)x=0時(shí),折痕EF的長(zhǎng)為_(kāi)_____;當(dāng)點(diǎn)E與點(diǎn)A重合時(shí),折痕EF的長(zhǎng)為_(kāi)_____

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(2009•義烏)如圖,在矩形ABCD中,AB=3,AD=1,點(diǎn)P在線段AB上運(yùn)動(dòng),設(shè)AP=x,現(xiàn)將紙片折疊,使點(diǎn)D與點(diǎn)P重合,得折痕EF(點(diǎn)E、F為折痕與矩形邊的交點(diǎn)),再將紙片還原.
(1)當(dāng)x=0時(shí),折痕EF的長(zhǎng)為_(kāi)_____;當(dāng)點(diǎn)E與點(diǎn)A重合時(shí),折痕EF的長(zhǎng)為_(kāi)_____

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(2009•義烏)如圖,在矩形ABCD中,AB=3,AD=1,點(diǎn)P在線段AB上運(yùn)動(dòng),設(shè)AP=x,現(xiàn)將紙片折疊,使點(diǎn)D與點(diǎn)P重合,得折痕EF(點(diǎn)E、F為折痕與矩形邊的交點(diǎn)),再將紙片還原.
(1)當(dāng)x=0時(shí),折痕EF的長(zhǎng)為_(kāi)_____;當(dāng)點(diǎn)E與點(diǎn)A重合時(shí),折痕EF的長(zhǎng)為_(kāi)_____

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(2009•義烏)如圖,在矩形ABCD中,AB=3,AD=1,點(diǎn)P在線段AB上運(yùn)動(dòng),設(shè)AP=x,現(xiàn)將紙片折疊,使點(diǎn)D與點(diǎn)P重合,得折痕EF(點(diǎn)E、F為折痕與矩形邊的交點(diǎn)),再將紙片還原.
(1)當(dāng)x=0時(shí),折痕EF的長(zhǎng)為_(kāi)_____;當(dāng)點(diǎn)E與點(diǎn)A重合時(shí),折痕EF的長(zhǎng)為_(kāi)_____

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