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设过点P(x,y)的直线分别与x轴的正半轴和y轴的正半轴交于A、B两点,点Q与点...
设过点P(x,y)的直线分别与x轴的正半轴和y轴的正半轴交于A、B两点,点Q与点P关于x轴对称,O为坐标原点,若
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,且
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,则P点的轨迹方程是( )
A.
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B.
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C.
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D.
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考点分析:
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定义符合条件
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的有序数对(x,y)为“和谐格点”,则当a=3时,和谐格点的个数是( )
A.5
B.6
C.7
D.8
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已知数列{a
n}的前n项和为S
n,对任意n∈N
*都有S
n=
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a
n-
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,且1<S
k<9,则k的值为( )
A.2
B.4
C.5
D.6
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设a、b、c表示三条直线,α、β表示两个平面,则下列命题的逆命题不成立的是( )
A.c⊥α,若c⊥β,则α∥β
B.b⊂β,c是a在β内的射影,若b⊥c,则a⊥b
C.b⊂β,若b⊥α则β⊥α
D.b⊂α,c⊄α,若c∥α,则b∥c
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在△ABC中,a,b,c分别是A,B,C的对边,
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,且f(A)=2,b=1,△ABC的面积是
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,则
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的值是( )
A.2
B.2
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C.4
D.2
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已知不等式(x+y)(
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)≥9对任意正实数x,y恒成立,则正实数a的最小值是( )
A.2
B.4
C.6
D.8
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