已知m和n是方程2x
2-5x-3=0的两根,则
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=
.
考点分析:
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D.
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如图,△ABC中,AB=AC,点D、E分别是边AB、AC的中点,点G、F在BC边上,四边形DEFG是正方形.若DE=2cm,则AC的长为( )
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若0<x<1,则x
-1、x、x
2的大小关系是( )
A.x
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2B.x<x
2<x
-1C.x
2<x<x
-1D.x
2<x
-1<
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如图,AB与⊙O相切于点B,AO的延长线交⊙O于点C,连接BC,若∠ABC=120°,OC=3,则
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D.5π
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关于x的一元二次方程x
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