1、菱形abcd的面积为25,顶点a(-3,1)、c(5,7),求它四边所在的直线方程2、已知直线l过点A(-2,1),且与直线m:2x-y+1=0的夹角为arctan1/2,求直线l的方程
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![1、菱形abcd的面积为25,顶点a(-3,1)、c(5,7),求它四边所在的直线方程2、已知直线l过点A(-2,1),且与直线m:2x-y+1=0的夹角为arctan1/2,求直线l的方程](/uploads/image/z/2714373-45-3.jpg?t=1%E3%80%81%E8%8F%B1%E5%BD%A2abcd%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA25%2C%E9%A1%B6%E7%82%B9a%28-3%2C1%29%E3%80%81c%285%2C7%29%2C%E6%B1%82%E5%AE%83%E5%9B%9B%E8%BE%B9%E6%89%80%E5%9C%A8%E7%9A%84%E7%9B%B4%E7%BA%BF%E6%96%B9%E7%A8%8B2%E3%80%81%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%E8%BF%87%E7%82%B9A%EF%BC%88-2%2C1%EF%BC%89%2C%E4%B8%94%E4%B8%8E%E7%9B%B4%E7%BA%BFm%EF%BC%9A2x-y%2B1%3D0%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BAarctan1%2F2%2C%E6%B1%82%E7%9B%B4%E7%BA%BFl%E7%9A%84%E6%96%B9%E7%A8%8B)
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