1:在△ABC中,∠B=30°,∠C=45°,AC=2,求AB和BC2:AC⊥BC,COS∠ADC=4/5,∠B=30°,AD=10,求BD的长3:在△ABC中,∠CAB=120°,AB=4,AC=2,AD⊥BC,D为垂足,求AD的长
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![1:在△ABC中,∠B=30°,∠C=45°,AC=2,求AB和BC2:AC⊥BC,COS∠ADC=4/5,∠B=30°,AD=10,求BD的长3:在△ABC中,∠CAB=120°,AB=4,AC=2,AD⊥BC,D为垂足,求AD的长](/uploads/image/z/10888528-40-8.jpg?t=1%EF%BC%9A%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0B%3D30%C2%B0%2C%E2%88%A0C%3D45%C2%B0%2CAC%3D2%2C%E6%B1%82AB%E5%92%8CBC2%EF%BC%9AAC%E2%8A%A5BC%2CCOS%E2%88%A0ADC%3D4%2F5%2C%E2%88%A0B%3D30%C2%B0%2CAD%3D10%2C%E6%B1%82BD%E7%9A%84%E9%95%BF3%EF%BC%9A%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0CAB%3D120%C2%B0%2CAB%3D4%2CAC%3D2%2CAD%E2%8A%A5BC%2CD%E4%B8%BA%E5%9E%82%E8%B6%B3%2C%E6%B1%82AD%E7%9A%84%E9%95%BF)
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