在直三棱柱中,AB=AC=1,∠BAC=90·,异面直线A1B与B1C1所成的角60·,设AA1=a1.求a的值 2.求平面A1BC1与B1BC1所成的锐二面角的大小
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![在直三棱柱中,AB=AC=1,∠BAC=90·,异面直线A1B与B1C1所成的角60·,设AA1=a1.求a的值 2.求平面A1BC1与B1BC1所成的锐二面角的大小](/uploads/image/z/5500316-20-6.jpg?t=%E5%9C%A8%E7%9B%B4%E4%B8%89%E6%A3%B1%E6%9F%B1%E4%B8%AD%2CAB%3DAC%3D1%2C%E2%88%A0BAC%3D90%C2%B7%2C%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFA1B%E4%B8%8EB1C1%E6%89%80%E6%88%90%E7%9A%84%E8%A7%9260%C2%B7%2C%E8%AE%BEAA1%3Da1.%E6%B1%82a%E7%9A%84%E5%80%BC+2.%E6%B1%82%E5%B9%B3%E9%9D%A2A1BC1%E4%B8%8EB1BC1%E6%89%80%E6%88%90%E7%9A%84%E9%94%90%E4%BA%8C%E9%9D%A2%E8%A7%92%E7%9A%84%E5%A4%A7%E5%B0%8F)
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