三道向量题,1.单位向量e1,e2的夹角为60°,则向量3e1+4e2与e1的夹角的余弦值?2.与向量(4,-3)垂直的单位向量的坐标.3.已知|OA|=|OB|=1,向量0A与OB的夹角为120°,向量OA与OC的夹角为45°,|OC|=5用向量OA,OB
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![三道向量题,1.单位向量e1,e2的夹角为60°,则向量3e1+4e2与e1的夹角的余弦值?2.与向量(4,-3)垂直的单位向量的坐标.3.已知|OA|=|OB|=1,向量0A与OB的夹角为120°,向量OA与OC的夹角为45°,|OC|=5用向量OA,OB](/uploads/image/z/8901589-13-9.jpg?t=%E4%B8%89%E9%81%93%E5%90%91%E9%87%8F%E9%A2%98%2C1.%E5%8D%95%E4%BD%8D%E5%90%91%E9%87%8Fe1%2Ce2%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA60%C2%B0%2C%E5%88%99%E5%90%91%E9%87%8F3e1%2B4e2%E4%B8%8Ee1%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%3F2.%E4%B8%8E%E5%90%91%E9%87%8F%EF%BC%884%2C-3%EF%BC%89%E5%9E%82%E7%9B%B4%E7%9A%84%E5%8D%95%E4%BD%8D%E5%90%91%E9%87%8F%E7%9A%84%E5%9D%90%E6%A0%87.3.%E5%B7%B2%E7%9F%A5%7COA%7C%3D%7COB%7C%3D1%2C%E5%90%91%E9%87%8F0A%E4%B8%8EOB%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA120%C2%B0%2C%E5%90%91%E9%87%8FOA%E4%B8%8EOC%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA45%C2%B0%2C%7COC%7C%3D5%E7%94%A8%E5%90%91%E9%87%8FOA%2COB)
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