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在△ABC中,E,F分别为AB,AC的中点,P为EF上的任一点,实数x,y满足,...
在△ABC中,E,F分别为AB,AC的中点,P为EF上的任一点,实数x,y满足
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,设△ABC,△PBC,△PCA,△PAB的面积分别为S,S
1,S
2,S
3,记
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,则λ
2•λ
3取到最大值时,2x+y的值为( )
A.-1
B.1
C.
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D.
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