高中数学立体几何题!急!谢谢!在矩形ABCD中,AB=4,AD=2,E为AB的中点.现将三角形ADE沿直线DE翻折三角形A`DE,使平面A`DE垂直于平面BCDE,F为线段A`D的中点.(1)求证:EF平行于平面A`BC(2)求三棱锥A`—BCE的
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![高中数学立体几何题!急!谢谢!在矩形ABCD中,AB=4,AD=2,E为AB的中点.现将三角形ADE沿直线DE翻折三角形A`DE,使平面A`DE垂直于平面BCDE,F为线段A`D的中点.(1)求证:EF平行于平面A`BC(2)求三棱锥A`—BCE的](/uploads/image/z/7246727-71-7.jpg?t=%E9%AB%98%E4%B8%AD%E6%95%B0%E5%AD%A6%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%E9%A2%98%21%E6%80%A5%21%E8%B0%A2%E8%B0%A2%21%E5%9C%A8%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D4%2CAD%3D2%2CE%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9.%E7%8E%B0%E5%B0%86%E4%B8%89%E8%A7%92%E5%BD%A2ADE%E6%B2%BF%E7%9B%B4%E7%BA%BFDE%E7%BF%BB%E6%8A%98%E4%B8%89%E8%A7%92%E5%BD%A2A%60DE%2C%E4%BD%BF%E5%B9%B3%E9%9D%A2A%60DE%E5%9E%82%E7%9B%B4%E4%BA%8E%E5%B9%B3%E9%9D%A2BCDE%2CF%E4%B8%BA%E7%BA%BF%E6%AE%B5A%60D%E7%9A%84%E4%B8%AD%E7%82%B9.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AEF%E5%B9%B3%E8%A1%8C%E4%BA%8E%E5%B9%B3%E9%9D%A2A%60BC%282%29%E6%B1%82%E4%B8%89%E6%A3%B1%E9%94%A5A%60%E2%80%94BCE%E7%9A%84)
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