1.已知直线x-ax-4=0与直线y+-2x+4的夹角θ=arccos 5分之2倍根5 .求实数a的值.2.已知直线l经过点(5,10),且它与原点的距离为5,球直线l的方程.3.已知直线x-ay=0(a≥0),求这条直线的倾斜角4.是否存在实数m,
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![1.已知直线x-ax-4=0与直线y+-2x+4的夹角θ=arccos 5分之2倍根5 .求实数a的值.2.已知直线l经过点(5,10),且它与原点的距离为5,球直线l的方程.3.已知直线x-ay=0(a≥0),求这条直线的倾斜角4.是否存在实数m,](/uploads/image/z/191845-37-5.jpg?t=1.%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFx-ax-4%3D0%E4%B8%8E%E7%9B%B4%E7%BA%BFy%2B-2x%2B4%E7%9A%84%E5%A4%B9%E8%A7%92%CE%B8%3Darccos+5%E5%88%86%E4%B9%8B2%E5%80%8D%E6%A0%B95+.%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%E7%BB%8F%E8%BF%87%E7%82%B9%285%2C10%29%2C%E4%B8%94%E5%AE%83%E4%B8%8E%E5%8E%9F%E7%82%B9%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA5%2C%E7%90%83%E7%9B%B4%E7%BA%BFl%E7%9A%84%E6%96%B9%E7%A8%8B.3.%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFx-ay%3D0%28a%E2%89%A50%29%2C%E6%B1%82%E8%BF%99%E6%9D%A1%E7%9B%B4%E7%BA%BF%E7%9A%84%E5%80%BE%E6%96%9C%E8%A7%924.%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E5%AE%9E%E6%95%B0m%2C)
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