(2008•安徽)化简
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=
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(2008•安徽)如图,在△ABC中,AB=AC=5,BC=6,点M为BC的中点,MN⊥AC于点N,则MN等于( )
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A.
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B.
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C.
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D.
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A.
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C.
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C.-2
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(2011•济宁)如图是某几何体的三视图及相关数据,则判断正确的是( )
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