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从0,1,2,3,4,5,6,7,8,9十个数字中,选出一个偶数和三个奇数,组成...
从0,1,2,3,4,5,6,7,8,9十个数字中,选出一个偶数和三个奇数,组成一个没有重复数字的四位数,这样的四位数共有( )
A.1480个
B.1440个
C.1200个
D.1140个
考点分析:
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已知双曲线的两个焦点为F
1(-
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,0)、F
2(
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,0),M是此双曲线上的一点,且满足
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•
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=0,|
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|•|
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|=2,则该双曲线的方程是( )
A.
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-y
2=1
B.x
2-
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=1
C.
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-
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=1
D.
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-
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=1
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如果
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,
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是平面a内所有向量的一组基底,那么( )
A.若实数λ
1,λ
2使
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+
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=
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,则λ
1=λ
2=0
B.空间任一向量可以表示为
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=
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+
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,这里λ
1,λ
2∈R
C.对实数λ
1,λ
2,
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+
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不一定在平面a内
D.对平面a中的任一向量
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,使
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=
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+
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的实数λ
1,λ
2有无数对
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已知数列{a
n}满足a
n=2a
n-1+2
n+2(n≥2),a
1=2.
(1)是否存在一个实数t,使得数列
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成等差数列,若存在,求出t的值;若不存在,请说明理由;
(2)设数列{a
n}的前n项和为S
n,判断S
n与n
3+n
2的大小,并说明理由.
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设函数f(x)=x
3+ax和g(x)=bx
2+c的一个交点为P(1,m),函数f(x)与g(x)在P点处的切线的斜率的和为2,
(1)用m表示a、b、c;
(2)若函数y=f(x)-g(x)在
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上是增函数,在
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在△ABC中,D为AC的中点,
(1)若O是中线BD上的一个动点,且
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