如图,Rt△ABC是一防洪堤背水坡的横截面图,斜坡AB的长为12m,它的坡角为45°,为了提高该堤的防洪能力,现将背水坡进行改造,使它的倾斜角正切值为2/3,求DB的长
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![如图,Rt△ABC是一防洪堤背水坡的横截面图,斜坡AB的长为12m,它的坡角为45°,为了提高该堤的防洪能力,现将背水坡进行改造,使它的倾斜角正切值为2/3,求DB的长](/uploads/image/z/13209999-15-9.jpg?t=%E5%A6%82%E5%9B%BE%2CRt%E2%96%B3ABC%E6%98%AF%E4%B8%80%E9%98%B2%E6%B4%AA%E5%A0%A4%E8%83%8C%E6%B0%B4%E5%9D%A1%E7%9A%84%E6%A8%AA%E6%88%AA%E9%9D%A2%E5%9B%BE%2C%E6%96%9C%E5%9D%A1AB%E7%9A%84%E9%95%BF%E4%B8%BA12m%2C%E5%AE%83%E7%9A%84%E5%9D%A1%E8%A7%92%E4%B8%BA45%C2%B0%2C%E4%B8%BA%E4%BA%86%E6%8F%90%E9%AB%98%E8%AF%A5%E5%A0%A4%E7%9A%84%E9%98%B2%E6%B4%AA%E8%83%BD%E5%8A%9B%2C%E7%8E%B0%E5%B0%86%E8%83%8C%E6%B0%B4%E5%9D%A1%E8%BF%9B%E8%A1%8C%E6%94%B9%E9%80%A0%2C%E4%BD%BF%E5%AE%83%E7%9A%84%E5%80%BE%E6%96%9C%E8%A7%92%E6%AD%A3%E5%88%87%E5%80%BC%E4%B8%BA2%2F3%2C%E6%B1%82DB%E7%9A%84%E9%95%BF)
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