已知在△ABC中,EF//BC,DF//AB,连CE,AD分别交DF,EF于N.F,(1)如图1,若D,E分别BC,AB的中点,图中与MN平行直线有哪几条,并证明;(2)如图2,若D,E不为BC,AB的中点,(1)的结论是否仍成立,并证明.(只需要
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 00:37:13
![已知在△ABC中,EF//BC,DF//AB,连CE,AD分别交DF,EF于N.F,(1)如图1,若D,E分别BC,AB的中点,图中与MN平行直线有哪几条,并证明;(2)如图2,若D,E不为BC,AB的中点,(1)的结论是否仍成立,并证明.(只需要](/uploads/image/z/6942552-24-2.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%EF%BC%881%EF%BC%89%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%E5%93%AA%E5%87%A0%E6%9D%A1%2C%E5%B9%B6%E8%AF%81%E6%98%8E%EF%BC%9B%EF%BC%882%EF%BC%89%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%2C%E5%B9%B6%E8%AF%81%E6%98%8E.%EF%BC%88%E5%8F%AA%E9%9C%80%E8%A6%81)
x]oPƿB֔%`Tݨ++!Ft1acg:bzrW04[+/y#KGƍwOc;Q4 $W,ND%G6&SYtd3QwJvJ$X{L~iH>A2
w^]{ݢs/ztT'dtIFdw+
Uǫv=mh&x;i<
:EIYsĿs`6^{ Ag$c%ޕ-+2Sn<`PP0o sȆvV+a