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“a=1”是“直线ax-y=0和直线x+(1-a)y+3=0互相垂直”的( ) ...
“a=1”是“直线ax-y=0和直线x+(1-a)y+3=0互相垂直”的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
考点分析:
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若某空间几何体的三视图如图所示,则该几何体的体积是( )
A.2
B.1
C.
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D.
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设z=1+i(i是虚数单位),则
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等于( )
A.1+i
B.-1+i
C.-i
D.-1-i
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已知集合A={1,2
a},B={a,b},若
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,则A∪B为( )
A.
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B.
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C.
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D.
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设函数
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.
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(Ⅱ)当a>1时,讨论函数f(x)的单调性.
(Ⅲ)若对任意a∈(3,4)及任意x
1,x
2∈[1,2],恒有
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成立,求实数m的取值范围.
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的焦距等于2|ON|,且过点
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(Ⅱ) 设椭圆D与x轴负半轴的交点为P,若过点M的动直线l与椭圆D交于A、B两点,∠ANM=∠BNP是否恒成立?给出你的判断并说明理由.
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