1如图所示,圆O的内接△ABC中,∠BAC=45°,AD‖OC并交BC的延长线与D点,OC交AB与E点(1)求∠D的度数(2)求证AC²=AD.CE2已知,如图△ABC中∠BAC=90°,AB=AC=1,点D是BC边上的一个动点(不与BC重合),∠ADE=4
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![1如图所示,圆O的内接△ABC中,∠BAC=45°,AD‖OC并交BC的延长线与D点,OC交AB与E点(1)求∠D的度数(2)求证AC²=AD.CE2已知,如图△ABC中∠BAC=90°,AB=AC=1,点D是BC边上的一个动点(不与BC重合),∠ADE=4](/uploads/image/z/2655311-23-1.jpg?t=1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%86O%E7%9A%84%E5%86%85%E6%8E%A5%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0BAC%3D45%C2%B0%2CAD%E2%80%96OC%E5%B9%B6%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8ED%E7%82%B9%2COC%E4%BA%A4AB%E4%B8%8EE%E7%82%B9%EF%BC%881%EF%BC%89%E6%B1%82%E2%88%A0D%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81AC%26sup2%3B%3DAD.CE2%E5%B7%B2%E7%9F%A5%2C%E5%A6%82%E5%9B%BE%E2%96%B3ABC%E4%B8%AD%E2%88%A0BAC%3D90%C2%B0%2CAB%3DAC%3D1%2C%E7%82%B9D%E6%98%AFBC%E8%BE%B9%E4%B8%8A%E7%9A%84%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%EF%BC%88%E4%B8%8D%E4%B8%8EBC%E9%87%8D%E5%90%88%EF%BC%89%2C%E2%88%A0ADE%3D4)
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