知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 【快点啊~】
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![知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 【快点啊~】](/uploads/image/z/2522733-69-3.jpg?t=%E7%9F%A5%EF%BC%9A%E5%B9%B3%E9%9D%A2ABD%E4%BA%A4%E5%B9%B3%E9%9D%A2BCD%3DBD%2CAE%2FAB%3DCH%2FBC%3D1%2F3%2CAF%2FAD%3DCG%2FCD%3D1%2F2%2C%E6%B1%82%E8%AF%81%EF%BC%9ABD%2CEF%2CGH%E5%85%B1%E7%82%B9+%E7%9F%A5%EF%BC%9A%E5%B9%B3%E9%9D%A2ABD%E4%BA%A4%E5%B9%B3%E9%9D%A2BCD%3DBD%2CAE%2FAB%3DCH%2FBC%3D1%2F3%2CAF%2FAD%3DCG%2FCD%3D1%2F2%2C%E6%B1%82%E8%AF%81%EF%BC%9ABD%2CEF%2CGH%E5%85%B1%E7%82%B9++++%E3%80%90%E5%BF%AB%E7%82%B9%E5%95%8A%7E%E3%80%91)
知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 【快点啊~】
知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点
知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 【快点啊~】
知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 知:平面ABD交平面BCD=BD,AE/AB=CH/BC=1/3,AF/AD=CG/CD=1/2,求证:BD,EF,GH共点 【快点啊~】
连接EH,AC,FG
∵AE/AB=CH/BC=1/3
∴EH||AC
∵AF/AD=CG/CD=1/2
∴FG||AC
∴EH||FG
∴G、E、F、H四点共面
∵EF与GH不平行
∴EF与GH相交,设交点为O,则O∈面ABD,O∈面BCD
而平面ABD∩平面BCD=BD
∴EF、GH、BD交于一点