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如图所示,点O是直线AB上的点,OC平分∠AOD,∠BOD=40°,则∠AOC=...
如图所示,点O是直线AB上的点,OC平分∠AOD,∠BOD=40°,则∠AOC=
°.
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考点分析:
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若分式
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有意义,那么x的取值范围为
.
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梯形ABCD中AB∥CD,∠ADC+∠BCD=90°,以AD、AB、BC为斜边向外作等腰直角三角形,其面积分别是S
1、S
2、S
3,且S
1+S
3=4S
2,则CD=( )
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A.2.5AB
B.3AB
C.3.5AB
D.4AB
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不等式
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≤1的解集在数轴上表示正确的是( )
A.
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B.
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C.
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D.
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下列说法:①过三点可以作圆;②相等的圆心角所对的弧相等; ③在⊙O内经过一点P的所有弦中,以与OP垂直的弦最短;④三角形的外心到三角形的三个顶点的距离相等.其中正确的有( )
A.1个
B.2个
C.3个
D.4个
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