不等式组
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的解集是
.
考点分析:
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如图,菱形OABC的一边OA在x轴上,将菱形OABC绕原点O顺时针旋转75°至OA′B′C′的位置,若OB=
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,∠C=120°,则点B′的坐标为( )
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A.(3,
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)
B.(3,
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C.(
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D.(
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如图,点A、B、P在⊙O上,且∠APB=50°.若点M是⊙O上的动点,要使△ABM为等腰三角形,则所有符合条件的点M有( )
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B.2个
C.3个
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已知下列命题:
①若a>0,b>0,则a+b>0;
②若a≠b,则a
2≠b
2;
③角的平分线上的点到角的两边的距离相等;
④平行四边形的对角线互相平分.
其中原命题与逆命题均为真命题的个数是( )
A.1个
B.2个
C.3个
D.4个
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如图所示,四边形ABCD中,DC∥AB,BC=1,AB=AC=AD=2.则BD的长为( )
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A.
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B.
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C.
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D.
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如果一个空间几何体的主视图和左视图都是边长为2的正三角形,俯视图是圆且中间有一点.那么这个几何体的表面积是( )
A.3π
B.2π
C.
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D.3
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