1.在长方体ABCD-A1B1C1D1中,AB=4,BC=3,CC1=2,求A1B与面ABCD所成的角____2.在△ABC中,已知b=4,c=2,∠A=120°,则a=____3.已知向量|a|=3,向量b=(1,2),且向量a⊥向量b,则向量a的坐标是________
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![1.在长方体ABCD-A1B1C1D1中,AB=4,BC=3,CC1=2,求A1B与面ABCD所成的角____2.在△ABC中,已知b=4,c=2,∠A=120°,则a=____3.已知向量|a|=3,向量b=(1,2),且向量a⊥向量b,则向量a的坐标是________](/uploads/image/z/12360215-47-5.jpg?t=1.%E5%9C%A8%E9%95%BF%E6%96%B9%E4%BD%93ABCD-A1B1C1D1%E4%B8%AD%2CAB%3D4%2CBC%3D3%2CCC1%3D2%2C%E6%B1%82A1B%E4%B8%8E%E9%9D%A2ABCD%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92____2.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5b%3D4%2Cc%3D2%2C%E2%88%A0A%3D120%C2%B0%2C%E5%88%99a%3D____3.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8F%7Ca%7C%3D3%2C%E5%90%91%E9%87%8Fb%3D%281%2C2%29%2C%E4%B8%94%E5%90%91%E9%87%8Fa%E2%8A%A5%E5%90%91%E9%87%8Fb%2C%E5%88%99%E5%90%91%E9%87%8Fa%E7%9A%84%E5%9D%90%E6%A0%87%E6%98%AF________)
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