已知α ∈(0,4),β∈(0,π),且tan(α-β)=1/2,tanβ=-1/7,求tan(2α-β)的值及角2α-β.必有重谢已知直线l与直线3x+4y-2=0平行且与两坐标轴的正半轴围成的面积为12(1)求直线l的方程 (2)若直线j与l垂
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![已知α ∈(0,4),β∈(0,π),且tan(α-β)=1/2,tanβ=-1/7,求tan(2α-β)的值及角2α-β.必有重谢已知直线l与直线3x+4y-2=0平行且与两坐标轴的正半轴围成的面积为12(1)求直线l的方程 (2)若直线j与l垂](/uploads/image/z/1649413-37-3.jpg?t=%E5%B7%B2%E7%9F%A5%CE%B1+%E2%88%88%EF%BC%880%2C4%EF%BC%89%2C%CE%B2%E2%88%88%EF%BC%880%2C%CF%80%EF%BC%89%2C%E4%B8%94tan%28%CE%B1-%CE%B2%29%3D1%2F2%2Ctan%CE%B2%3D-1%2F7%2C%E6%B1%82tan%282%CE%B1-%CE%B2%29%E7%9A%84%E5%80%BC%E5%8F%8A%E8%A7%922%CE%B1-%CE%B2.%E5%BF%85%E6%9C%89%E9%87%8D%E8%B0%A2%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%E4%B8%8E%E7%9B%B4%E7%BA%BF3x%2B4y-2%3D0%E5%B9%B3%E8%A1%8C%E4%B8%94%E4%B8%8E%E4%B8%A4%E5%9D%90%E6%A0%87%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E5%9B%B4%E6%88%90%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA12%EF%BC%881%EF%BC%89%E6%B1%82%E7%9B%B4%E7%BA%BFl%E7%9A%84%E6%96%B9%E7%A8%8B+%EF%BC%882%EF%BC%89%E8%8B%A5%E7%9B%B4%E7%BA%BFj%E4%B8%8El%E5%9E%82)
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