如图 三角形ABC中 角ACB=90°点D在CA上,使得CD=1,AD=3,并且角BDC=3角BAC,求BC的长如题···········有解答··········但是我看不懂···········所以请详细些······越详细越好····关
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![如图 三角形ABC中 角ACB=90°点D在CA上,使得CD=1,AD=3,并且角BDC=3角BAC,求BC的长如题···········有解答··········但是我看不懂···········所以请详细些······越详细越好····关](/uploads/image/z/5239281-57-1.jpg?t=%E5%A6%82%E5%9B%BE+%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD+%E8%A7%92ACB%3D90%C2%B0%E7%82%B9D%E5%9C%A8CA%E4%B8%8A%2C%E4%BD%BF%E5%BE%97CD%3D1%2CAD%3D3%2C%E5%B9%B6%E4%B8%94%E8%A7%92BDC%3D3%E8%A7%92BAC%2C%E6%B1%82BC%E7%9A%84%E9%95%BF%E5%A6%82%E9%A2%98%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E6%9C%89%E8%A7%A3%E7%AD%94%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E4%BD%86%E6%98%AF%E6%88%91%E7%9C%8B%E4%B8%8D%E6%87%82%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E6%89%80%E4%BB%A5%E8%AF%B7%E8%AF%A6%E7%BB%86%E4%BA%9B%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E8%B6%8A%E8%AF%A6%E7%BB%86%E8%B6%8A%E5%A5%BD%C2%B7%C2%B7%C2%B7%C2%B7%E5%85%B3)
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