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如图,点A(1,1),B(3,1),C(3,-1),D(1,-1)构成正方形AB...
如图,点A(1,1),B(3,1),C(3,-1),D(1,-1)构成正方形ABCD,以AB为边做等边△ABE,则∠ADE和点E的坐标分别为( )
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A.15°和(2,1+
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)
B.75°和(2,
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-1)
C.15°和(2,1+
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)或75°和(2,
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-1)
D.15°和(2,1+
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)或75°和(2,1-
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)
考点分析:
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