求助初三相似形数学题1 矩形ABCD中,AB=4,BC=12,点F在AD边上,AF:FD=1:3,CE垂直BF于E.求△BCE的周长 (没有图) 2 在△ABC中,D是BC的中点,且AD=AC,DE垂直于BC,DE于AB相交于点E,EC于AD相交于点F,(1)求证
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![求助初三相似形数学题1 矩形ABCD中,AB=4,BC=12,点F在AD边上,AF:FD=1:3,CE垂直BF于E.求△BCE的周长 (没有图) 2 在△ABC中,D是BC的中点,且AD=AC,DE垂直于BC,DE于AB相交于点E,EC于AD相交于点F,(1)求证](/uploads/image/z/7043328-0-8.jpg?t=%E6%B1%82%E5%8A%A9%E5%88%9D%E4%B8%89%E7%9B%B8%E4%BC%BC%E5%BD%A2%E6%95%B0%E5%AD%A6%E9%A2%981++++++%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D4%2CBC%3D12%2C%E7%82%B9F%E5%9C%A8AD%E8%BE%B9%E4%B8%8A%2CAF%3AFD%3D1%3A3%2CCE%E5%9E%82%E7%9B%B4BF%E4%BA%8EE.%E6%B1%82%E2%96%B3BCE%E7%9A%84%E5%91%A8%E9%95%BF+%EF%BC%88%E6%B2%A1%E6%9C%89%E5%9B%BE%29+2++++++%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CD%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E4%B8%94AD%3DAC%2CDE%E5%9E%82%E7%9B%B4%E4%BA%8EBC%2CDE%E4%BA%8EAB%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E%2CEC%E4%BA%8EAD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81)
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