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在矩形ABCD中,AB=3,AD=4,P是AD上的动点,PE⊥AC于E,PF⊥B...
在矩形ABCD中,AB=3,AD=4,P是AD上的动点,PE⊥AC于E,PF⊥BD于F,则PE+PF的值为( )
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A.
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B.2
C.
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D.1
考点分析:
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