如果实数x、y满足
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的取值范围是
.
考点分析:
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数列5,55,555,5555,…的一个通项公式为a
n=
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已知各项均为正数的等比数列{a
n}满足a
7=a
6+2a
5,若存在两项a
m,a
n使得
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的最小值为( )
A.
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B.
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C.
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D.
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对于顶点在原点的抛物线,给出下列条件:
①焦点在x轴上;
②焦点在y轴上;
③抛物线上横坐标为1的点到焦点的距离等于6;
④由原点向过焦点的某直线作垂线,垂足为(2,1).
其中能使抛物线方程为y
2=l0x条件是( )
A.①③
B.②④
C.②③
D.①④
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α,β,γ是三个不同平面,则下列命题正确的是( )
A.α⊥β,β⊥γ⇒α∥γ
B.α⊥β,β∥γ⇒α⊥γ
C.α,β,γ共点⇒α,β,γ共线
D.α⊥β,β⊥γ,γ⊥α⇒α,β,γ共线
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如图所示,点P是函数y=2sin(ωx+φ)(x∈R,ω>0)的图象的最高点,M、N是图象与x轴的交点,若
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=( )
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B.
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C.
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D.8
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