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如图19-1-21,在矩形ABCD中,AB=3,对角线AC,BD相交于点O,AE垂直平分OB于点E,则AD的长为 .
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如图矩形ABCD中AB=3BC=4对角线AC和BD相交于点0过0作OE⊥AC交AD于E则AE=
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