3的平方根是 .
考点分析:
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在直角梯形ABCD中,AD∥BC,∠ABC=90°,AB=BC,E为AB边上一点,∠BCE=15°,且AE=AD.连接DE交对角线AC于H,连接BH.下列结论:
①△ACD≌△ACE;②△CDE为等边三角形;③
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.
其中结论正确的是( )
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C.只有③④
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D.
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