如图,已知△ABC的中线BD、CE相交于点O、M、N分别为OB、OC的中点.
(1)求证:MD和NE互相平分;
(2)若BD⊥AC,EM=2
,OD+CD=7,求△OCB的面积.
(1)求证:MD和NE互相平分;
(2)若BD⊥AC,EM=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/28/2ab696e1-fabb-4503-8171-4986fe2bec8d.png?resizew=194)
更新时间:2016-12-06 02:54:51
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【推荐1】如图,在
中,
,M、N分别是
的中点.
是平行四边形;
(2)若
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(2)若
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【推荐2】如图,在平行四边形ABCD中,AC是它的一条对角线,过B、D两点作
,
,垂足分别为E、F,延长DE、BF分别交AB、CD于M,N两点.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760580827865088/2801595925962752/STEM/5e77fbcf-90b7-415d-a6ee-83d910bb5abb.png?resizew=231)
(1)求证:四边形BNDM是平行四边形;
(2)已知
,
,求AN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
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(1)求证:四边形BNDM是平行四边形;
(2)已知
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【推荐1】在
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将线段
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【推荐2】已知:如图,在
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