如图,四边形ABCD为正方形,PD⊥平面ABCD,PD∥QA,QA=AB=1/2PD(1)证明:平面PQC⊥平面DCQ(2)求二面角Q-BP-C的余弦值
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![如图,四边形ABCD为正方形,PD⊥平面ABCD,PD∥QA,QA=AB=1/2PD(1)证明:平面PQC⊥平面DCQ(2)求二面角Q-BP-C的余弦值](/uploads/image/z/1798478-62-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%BA%E6%AD%A3%E6%96%B9%E5%BD%A2%2CPD%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2CPD%E2%88%A5QA%2CQA%3DAB%3D1%EF%BC%8F2PD%281%29%E8%AF%81%E6%98%8E%EF%BC%9A%E5%B9%B3%E9%9D%A2PQC%E2%8A%A5%E5%B9%B3%E9%9D%A2DCQ%282%29%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92Q-BP-C%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC)
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如图,四边形ABCD为正方形,PD⊥平面ABCD,PD∥QA,QA=AB=1/2PD(1)证明:平面PQC⊥平面DCQ(2)求二面角Q-BP-C的余弦值
如图,四边形ABCD为正方形,PD⊥平面ABCD,PD∥QA,QA=AB=1/2PD(1)证明:平面PQC⊥平面DCQ(2)求二面角Q-BP-C的余弦值
如图,四边形ABCD为正方形,PD⊥平面ABCD,PD∥QA,QA=AB=1/2PD(1)证明:平面PQC⊥平面DCQ(2)求二面角Q-BP-C的余弦值
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看图,点击图片,另存为,看就可以了
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