如图在直角梯形ABCD中,角ADC等于90度,CD//AB,AB=2,AD=CD=1,将三角形ADC沿AC折起使平面ADC垂直ABC得到几何体D-ABC求几何体D-ABC的体积求二面角D-AB-C的正弦值
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![如图在直角梯形ABCD中,角ADC等于90度,CD//AB,AB=2,AD=CD=1,将三角形ADC沿AC折起使平面ADC垂直ABC得到几何体D-ABC求几何体D-ABC的体积求二面角D-AB-C的正弦值](/uploads/image/z/1122917-5-7.jpg?t=%E5%A6%82%E5%9B%BE%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2C%E8%A7%92ADC%E7%AD%89%E4%BA%8E90%E5%BA%A6%2CCD%2F%2FAB%2CAB%3D2%2CAD%3DCD%3D1%2C%E5%B0%86%E4%B8%89%E8%A7%92%E5%BD%A2ADC%E6%B2%BFAC%E6%8A%98%E8%B5%B7%E4%BD%BF%E5%B9%B3%E9%9D%A2ADC%E5%9E%82%E7%9B%B4ABC%E5%BE%97%E5%88%B0%E5%87%A0%E4%BD%95%E4%BD%93D-ABC%E6%B1%82%E5%87%A0%E4%BD%95%E4%BD%93D-ABC%E7%9A%84%E4%BD%93%E7%A7%AF%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92D-AB-C%E7%9A%84%E6%AD%A3%E5%BC%A6%E5%80%BC)
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