如图9-4-13,在空间四边形ABCD中,AB⊥CD,AC⊥BD,求证:AD⊥BC.解释我看不懂,设A点在平面BCD上的射影为H,分别连BH、CH、DH,并延长交对边于E、F、G.∵AB⊥CD,BE为AB在平面BCD上的射影,∴BE⊥CD.同理CF
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![如图9-4-13,在空间四边形ABCD中,AB⊥CD,AC⊥BD,求证:AD⊥BC.解释我看不懂,设A点在平面BCD上的射影为H,分别连BH、CH、DH,并延长交对边于E、F、G.∵AB⊥CD,BE为AB在平面BCD上的射影,∴BE⊥CD.同理CF](/uploads/image/z/3184641-9-1.jpg?t=%E5%A6%82%E5%9B%BE9-4-13%2C%E5%9C%A8%E7%A9%BA%E9%97%B4%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAB%E2%8A%A5CD%2CAC%E2%8A%A5BD%2C%E6%B1%82%E8%AF%81%EF%BC%9AAD%E2%8A%A5BC%EF%BC%8E%E8%A7%A3%E9%87%8A%E6%88%91%E7%9C%8B%E4%B8%8D%E6%87%82%2C%E8%AE%BEA%E7%82%B9%E5%9C%A8%E5%B9%B3%E9%9D%A2BCD%E4%B8%8A%E7%9A%84%E5%B0%84%E5%BD%B1%E4%B8%BAH%2C%E5%88%86%E5%88%AB%E8%BF%9EBH%E3%80%81CH%E3%80%81DH%2C%E5%B9%B6%E5%BB%B6%E9%95%BF%E4%BA%A4%E5%AF%B9%E8%BE%B9%E4%BA%8EE%E3%80%81F%E3%80%81G%EF%BC%8E%E2%88%B5AB%E2%8A%A5CD%2CBE%E4%B8%BAAB%E5%9C%A8%E5%B9%B3%E9%9D%A2BCD%E4%B8%8A%E7%9A%84%E5%B0%84%E5%BD%B1%2C%E2%88%B4BE%E2%8A%A5CD%EF%BC%8E%E5%90%8C%E7%90%86CF)
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