在小于100的正整数中能被7整除的所有数之和为 .
考点分析:
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抛物线y
2=2x上的点P到直线y=2x+4有最短的距离,则P的坐标是( )
A.(
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,
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B.(0,0)
C.(2,2)
D.
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”m>n>0”是”方程mx
2+ny
2=1表示焦点在y轴上的椭圆”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充要条件
D.既不充分也不必要条件
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若抛物线y
2=8x上一点P到其焦点的距离为9,则点P的坐标为( )
A.(7,±
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B.(14,±
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C.(7,±2
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D.(7,±2
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直线l:x-2y+2=0过椭圆左焦点F
1和一个顶点B,则该椭圆的离心率为( )
A.
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B.
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D.
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已知(3,1)和(-4,6)在直线3x-2y+a=0的两侧,则a的取值范围是( )
A.a<1或a>24
B.a=7或a=24
C.-7<a<24
D.-24<a<7
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