如图,在四边形ABCD中角DAB=角DCB=90度,对角线AC与BD相交于点O,M,N分别是BD,AC的中点(1)求证MN垂直于AC(2)当AC=8cm,BD= 10cm 时,求MN的长
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![如图,在四边形ABCD中角DAB=角DCB=90度,对角线AC与BD相交于点O,M,N分别是BD,AC的中点(1)求证MN垂直于AC(2)当AC=8cm,BD= 10cm 时,求MN的长](/uploads/image/z/3974010-42-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%E8%A7%92DAB%3D%E8%A7%92DCB%3D90%E5%BA%A6%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E4%B8%8EBD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AFBD%2CAC%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81MN%E5%9E%82%E7%9B%B4%E4%BA%8EAC%EF%BC%882%EF%BC%89%E5%BD%93AC%3D8cm%2CBD%3D+10cm+%E6%97%B6%2C%E6%B1%82MN%E7%9A%84%E9%95%BF)
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