已知三角形abc顶点的坐标是A[2,3]B[5,3]C[2,7]求角A的平分线长及所在直线的方程?【标准答案是平分线长根号二倍七分之十二,所在直线方程为x-y+1=0】关键是求平分线的长
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![已知三角形abc顶点的坐标是A[2,3]B[5,3]C[2,7]求角A的平分线长及所在直线的方程?【标准答案是平分线长根号二倍七分之十二,所在直线方程为x-y+1=0】关键是求平分线的长](/uploads/image/z/13286125-37-5.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2abc%E9%A1%B6%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E6%98%AFA%5B2%2C3%5DB%5B5%2C3%5DC%5B2%2C7%5D%E6%B1%82%E8%A7%92A%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%E9%95%BF%E5%8F%8A%E6%89%80%E5%9C%A8%E7%9B%B4%E7%BA%BF%E7%9A%84%E6%96%B9%E7%A8%8B%3F%E3%80%90%E6%A0%87%E5%87%86%E7%AD%94%E6%A1%88%E6%98%AF%E5%B9%B3%E5%88%86%E7%BA%BF%E9%95%BF%E6%A0%B9%E5%8F%B7%E4%BA%8C%E5%80%8D%E4%B8%83%E5%88%86%E4%B9%8B%E5%8D%81%E4%BA%8C%2C%E6%89%80%E5%9C%A8%E7%9B%B4%E7%BA%BF%E6%96%B9%E7%A8%8B%E4%B8%BAx-y%2B1%3D0%E3%80%91%E5%85%B3%E9%94%AE%E6%98%AF%E6%B1%82%E5%B9%B3%E5%88%86%E7%BA%BF%E7%9A%84%E9%95%BF)
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