如图所示,在Rt△ABC中,∠A=90°,AB=AC,D为AB上一点,tan∠DCB=1/5求AD/BD的值求S△ACD:S△ABC的值
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![如图所示,在Rt△ABC中,∠A=90°,AB=AC,D为AB上一点,tan∠DCB=1/5求AD/BD的值求S△ACD:S△ABC的值](/uploads/image/z/2391539-59-9.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0A%3D90%C2%B0%2CAB%3DAC%2CD%E4%B8%BAAB%E4%B8%8A%E4%B8%80%E7%82%B9%2Ctan%E2%88%A0DCB%3D1%2F5%E6%B1%82AD%2FBD%E7%9A%84%E5%80%BC%E6%B1%82S%E2%96%B3ACD%EF%BC%9AS%E2%96%B3ABC%E7%9A%84%E5%80%BC)
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