已知(x+y)2-2x-2y+1=0,则x+y= .
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如图,将矩形ABCD分割成一个阴影矩形与172个面积相等的小正方形,若阴影矩形长与宽的比为2:1,则矩形ABCD长与宽的比为( )
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A.2:1
B.29:15
C.60:31
D.31:16
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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
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如果△ABC中,sinA=cosB=
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,则下列最确切的结论是( )
A.△ABC是直角三角形
B.△ABC是等腰三角形
C.△ABC是等腰直角三角形
D.△ABC是锐角三角形
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在下列几何体中,主视图、左视图与俯视图都是相同的圆,该几何体是( )
A.
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B.
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C.
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D.
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