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如图,AB为半圆O的直径,AC是⊙O的一条弦,D为的中点,作DE⊥AC,交AB的延长线于点F,连接DA. (1)求证:EF为半圆O的切线; (2)若DA=DF=6,求阴影区域的面积.(结果保留根...
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教案备课库《2018年山东省淄博市临淄区中考数学一模试卷》真题及答案
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