在Rt三角形ABC中,D是斜边AB的中点,AC=6,BC=8,EC⊥平面ABC,且EC=12,则ED=?(1/2)在底面为平行四边形的四棱锥P-ABCD中,AB⊥AC,PA=AB,点E是PD的中点,(l)求证:AC⊥PB;(2)求证:PB平行平(2/2)面AEC经
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![在Rt三角形ABC中,D是斜边AB的中点,AC=6,BC=8,EC⊥平面ABC,且EC=12,则ED=?(1/2)在底面为平行四边形的四棱锥P-ABCD中,AB⊥AC,PA=AB,点E是PD的中点,(l)求证:AC⊥PB;(2)求证:PB平行平(2/2)面AEC经](/uploads/image/z/6865284-12-4.jpg?t=%E5%9C%A8Rt%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CD%E6%98%AF%E6%96%9C%E8%BE%B9AB%E7%9A%84%E4%B8%AD%E7%82%B9%2CAC%EF%BC%9D6%2CBC%EF%BC%9D8%2CEC%E2%8A%A5%E5%B9%B3%E9%9D%A2ABC%2C%E4%B8%94EC%EF%BC%9D12%2C%E5%88%99ED%EF%BC%9D%3F%281%2F2%29%E5%9C%A8%E5%BA%95%E9%9D%A2%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E7%9A%84%E5%9B%9B%E6%A3%B1%E9%94%A5P%EF%BC%8DABCD%E4%B8%AD%EF%BC%8CAB%E2%8A%A5AC%EF%BC%8CPA%EF%BC%9DAB%EF%BC%8C%E7%82%B9E%E6%98%AFPD%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%8C%28l%29%E6%B1%82%E8%AF%81%EF%BC%9AAC%E2%8A%A5PB%EF%BC%9B%282%29%E6%B1%82%E8%AF%81%EF%BC%9APB%E5%B9%B3%E8%A1%8C%E5%B9%B3%282%2F2%29%E9%9D%A2AEC%E7%BB%8F)
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