二.如图,四边形ABCD中,∠B=∠D=90°∠A=45°,AD=3,CD=1,求BC的长(图不太标准,将就看一下,自己重画一张也行)
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![二.如图,四边形ABCD中,∠B=∠D=90°∠A=45°,AD=3,CD=1,求BC的长(图不太标准,将就看一下,自己重画一张也行)](/uploads/image/z/2528910-54-0.jpg?t=%E4%BA%8C%EF%BC%8E%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0B%3D%E2%88%A0D%3D90%C2%B0%E2%88%A0A%3D45%C2%B0%2CAD%3D3%2CCD%3D1%2C%E6%B1%82BC%E7%9A%84%E9%95%BF%EF%BC%88%E5%9B%BE%E4%B8%8D%E5%A4%AA%E6%A0%87%E5%87%86%2C%E5%B0%86%E5%B0%B1%E7%9C%8B%E4%B8%80%E4%B8%8B%2C%E8%87%AA%E5%B7%B1%E9%87%8D%E7%94%BB%E4%B8%80%E5%BC%A0%E4%B9%9F%E8%A1%8C%EF%BC%89)
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