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已知三角形ABC中,点D是BC的中点,过点D的直线分别交直线AB,AC于E、F两...
已知三角形ABC中,点D是BC的中点,过点D的直线分别交直线AB,AC于E、F两点,若
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=
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(λ>0),
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=μ
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(μ>0),则
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的最小值是( )
A..9
B.
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C.5
D.
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已知实系数一元二次方程x
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