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若a,b,c是直角三角形△ABC的三边的长(c为斜边),则圆C:x2+y2=4被...
若a,b,c是直角三角形△ABC的三边的长(c为斜边),则圆C:x2+y2=4被直线l:ax+by+c=0所截得的弦长为 .
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AB是抛物线y
2=x的一条焦点弦,若|AB|=4,则AB的中点到直线
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的距离为
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若
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(i为虚数单位),则a+b=
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已知M是椭圆
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上一点,两焦点为F
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2,点P是△MF
1F
2的内心,连接MP并延长交F
1F
2于N,则
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的值为( )
A.
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B.
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C.
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D.
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已知
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,则
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与
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夹角的取值范围是( )
A.
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B.
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C.
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D.
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若两个等差数列{a
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n和T
n,已知
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=( )
A.7
B.
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C.
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D.
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