已知在△ABC中,EF//BC,DF//AB,连CE,AD分别交DF,EF于N.F,如图1,若D,E分别BC,AB的中点,图中与MN平行直线有那几条,并证明;如图2,若D,E不为BC,AB的中点,(1)的结论是否仍成立.
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![已知在△ABC中,EF//BC,DF//AB,连CE,AD分别交DF,EF于N.F,如图1,若D,E分别BC,AB的中点,图中与MN平行直线有那几条,并证明;如图2,若D,E不为BC,AB的中点,(1)的结论是否仍成立.](/uploads/image/z/8641426-58-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CEF%2F%2FBC%2CDF%2F%2FAB%2C%E8%BF%9ECE%2CAD%E5%88%86%E5%88%AB%E4%BA%A4DF%2CEF%E4%BA%8EN.F%2C%E5%A6%82%E5%9B%BE1%2C%E8%8B%A5D%2CE%E5%88%86%E5%88%ABBC%2CAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%9B%BE%E4%B8%AD%E4%B8%8EMN%E5%B9%B3%E8%A1%8C%E7%9B%B4%E7%BA%BF%E6%9C%89%E9%82%A3%E5%87%A0%E6%9D%A1%2C%E5%B9%B6%E8%AF%81%E6%98%8E%EF%BC%9B%E5%A6%82%E5%9B%BE2%2C%E8%8B%A5D%2CE%E4%B8%8D%E4%B8%BABC%2CAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%EF%BC%881%EF%BC%89%E7%9A%84%E7%BB%93%E8%AE%BA%E6%98%AF%E5%90%A6%E4%BB%8D%E6%88%90%E7%AB%8B.)
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