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在矩形中ABCD中,AB=3,AD=4,对角线AC与BD相交于点O,EF是经过点...
在矩形中ABCD中,AB=3,AD=4,对角线AC与BD相交于点O,EF是经过点O分别与AB、CD相交于点E、F的直线,则图中阴影部分的面积为
.
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如图,在Rt△ABC中,∠ACB=90°,点D是斜边AB的中点,DE⊥AC,垂足为E,若BC=4,CD=2
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,则BE的长为( )
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D.4
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将矩形ABCD沿AE折叠,使点D落在D′处,已知∠CED′=60°,DE=1,则DD′的长为( )
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A.
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B.
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C.2
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D.3
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