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如图所示,已知点E、F分别是△ABC中AC、AB边的中点,BE、CF相交于点G,...
如图所示,已知点E、F分别是△ABC中AC、AB边的中点,BE、CF相交于点G,FG=2,则CF的长为( )
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A.4
B.4.5
C.5
D.6
考点分析:
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如图,D、E分别是AB、AC的中点,则S
△ADE:S
△ABC=( )
A.1:2
B.1:3
C.1:4
D.2:3
查看答案
如图,△ABC中,点D、E分别是AB、AC的中点,则下列结论:①BC=2DE;②△ADE∽△ABC;③
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.其中正确的有( )
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A.3个
B.2个
C.1个
D.0个
查看答案
如图,已知等边三角形ABC的边长为2,DE是它的中位线,则下面四个结论:
(1)DE=1;
(2)AB边上的高为
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;
(3)△CDE∽△CAB;
(4)△CDE的面积与△CAB面积之比为1:4.
其中正确的有( )
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A.1个
B.2个
C.3个
D.4个
查看答案
如图,△ABC中,CD⊥AB于D,一定能确定△ABC为直角三角形的条件的个数是( )
①∠1=∠A;②
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;③∠B+∠2=90°;④BC:AC:AB=3:4:5;⑤AC•BD=AD•CD.
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A.1
B.2
C.3
D.4
查看答案
如图,Rt△ABC中,AB⊥AC,AB=3,AC=4,P是BC边上一点,作PE⊥AB于E,PD⊥AC于D,设BP=x,则PD+PE=( )
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A.
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B.
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C.
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D.
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