1.已知三角形ABC顶点B在平面α内,A和C在α的同一侧、AB和BC与α所成的角分别为30°和45°,若AB=3 bc=4倍根号2,ac=5,则AC和平面α成的角为()A.60°、B.45°、C.30°、D.15°2.已知平面α和β成60°二面角,P为
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![1.已知三角形ABC顶点B在平面α内,A和C在α的同一侧、AB和BC与α所成的角分别为30°和45°,若AB=3 bc=4倍根号2,ac=5,则AC和平面α成的角为()A.60°、B.45°、C.30°、D.15°2.已知平面α和β成60°二面角,P为](/uploads/image/z/9293589-45-9.jpg?t=1.%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E9%A1%B6%E7%82%B9B%E5%9C%A8%E5%B9%B3%E9%9D%A2%CE%B1%E5%86%85%2CA%E5%92%8CC%E5%9C%A8%CE%B1%E7%9A%84%E5%90%8C%E4%B8%80%E4%BE%A7%E3%80%81AB%E5%92%8CBC%E4%B8%8E%CE%B1%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E5%88%86%E5%88%AB%E4%B8%BA30%C2%B0%E5%92%8C45%C2%B0%2C%E8%8B%A5AB%3D3+bc%3D4%E5%80%8D%E6%A0%B9%E5%8F%B72%2Cac%3D5%2C%E5%88%99AC%E5%92%8C%E5%B9%B3%E9%9D%A2%CE%B1%E6%88%90%E7%9A%84%E8%A7%92%E4%B8%BA%EF%BC%88%EF%BC%89A.60%C2%B0%E3%80%81B.45%C2%B0%E3%80%81C.30%C2%B0%E3%80%81D.15%C2%B02.%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%CE%B1%E5%92%8C%CE%B2%E6%88%9060%C2%B0%E4%BA%8C%E9%9D%A2%E8%A7%92%2CP%E4%B8%BA)
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