如图所示,在四边形ABCD中,∠ABC=∠ADC=90°,M,N分别是AC,BD的中点,求证(1)MN⊥BD(2)当∠BAD=45°,BD=2,求MN的长
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![如图所示,在四边形ABCD中,∠ABC=∠ADC=90°,M,N分别是AC,BD的中点,求证(1)MN⊥BD(2)当∠BAD=45°,BD=2,求MN的长](/uploads/image/z/2768851-19-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0ABC%EF%BC%9D%E2%88%A0ADC%EF%BC%9D90%C2%B0%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AFAC%2CBD%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E8%AF%81%EF%BC%881%EF%BC%89MN%E2%8A%A5BD%282%29%E5%BD%93%E2%88%A0BAD%3D45%C2%B0%2CBD%3D2%2C%E6%B1%82MN%E7%9A%84%E9%95%BF)
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