四边形ABCD中,∠A=∠C=90°,M为BD上的任意一点,ME⊥AB于E,MF⊥CD于F.求证:MF·AD+ME·BC=AD·BC(1)四边形ABCD中,∠A=∠C=90°,M为BD上的任意一点,ME⊥AB于E,MF⊥CD于F.求证:MF·AD+ME·BC=AD·BC(2)在△ABC中,AB=
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![四边形ABCD中,∠A=∠C=90°,M为BD上的任意一点,ME⊥AB于E,MF⊥CD于F.求证:MF·AD+ME·BC=AD·BC(1)四边形ABCD中,∠A=∠C=90°,M为BD上的任意一点,ME⊥AB于E,MF⊥CD于F.求证:MF·AD+ME·BC=AD·BC(2)在△ABC中,AB=](/uploads/image/z/13401112-40-2.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0A%3D%E2%88%A0C%3D90%C2%B0%2CM%E4%B8%BABD%E4%B8%8A%E7%9A%84%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2CME%E2%8A%A5AB%E4%BA%8EE%2CMF%E2%8A%A5CD%E4%BA%8EF.%E6%B1%82%E8%AF%81%EF%BC%9AMF%C2%B7AD%2BME%C2%B7BC%3DAD%C2%B7BC%EF%BC%881%EF%BC%89%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0A%3D%E2%88%A0C%3D90%C2%B0%2CM%E4%B8%BABD%E4%B8%8A%E7%9A%84%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2CME%E2%8A%A5AB%E4%BA%8EE%2CMF%E2%8A%A5CD%E4%BA%8EF.%E6%B1%82%E8%AF%81%EF%BC%9AMF%C2%B7AD%2BME%C2%B7BC%3DAD%C2%B7BC%EF%BC%882%EF%BC%89%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3D)
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