计算:
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=
.
考点分析:
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已知在△ABC中,∠BAC=90°,M是边BC的中点,BC的延长线上的点N满足AM⊥AN.△ABC的内切圆与边AB、AC的切点分别为E、F,延长EF分别与AN、BC的延长线交于P、Q,则
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=( )
A.1
B.0.5
C.2
D.1.5
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边长为1的正方形OABC的顶点A在x正半轴上,点C在y正半轴上,将正方形OABC绕顶点O顺时针旋转75°,如图所示,使点B恰好落在函数y=ax
2(a<0)的图象上,则a的值为( )
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A.
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B.-1
C.
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D.
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如图,正ABC中,P为正三角形内任意一点,过P作PD⊥BC、PE⊥AB,PF⊥AC,连AP、BP、CP,如果S
△AFP+S
△PCD+S
△BPE=
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,那么△ABC的内切圆半径为( )
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A.1
B.
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C.2
D.
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已知y=
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+
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(x,y均为实数),则y的最大值与最小值的差为( )
A.2
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-1
B.4-2
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C.3-2
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D.2
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-2
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若a,b为方程x
2-6x+7=0的两个根,则
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A.
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B.
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C.
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D.
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