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如图,正方形ABCD的边长为4,点E、F分别在AB、BC上,且AE=BF=1,CE、DF交于点O,下列结论:①∠DOC=90°,②OC=OE,③CE=DF,④tan∠OCD=,⑤S△DOC=S四边形...
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教案备课库《2017年河北省廊坊市广阳区中考数学二模试卷》真题及答案
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