1 . 若点(2a,a+1)在以
为圆心,半径为
的圆内,则实数
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722130469f5aded0179c8e96fbb27007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30efdb9c7eb4b788352056f3edf21635.png)
![](https://img.xkw.com/dksih/QBM/2018/8/21/2015201294000128/2017352311971840/STEM/7585868472584892a91b1af8c7537b9d.png?resizew=13)
A.-1<a<1 | B.0<a<1 | C.-1<a<![]() | D.-![]() |
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2 . 圆
与圆
都关于直线
对称,则圆C与y轴交点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997385c6a0a904acfd45b4b0117158e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebb3b7f47e0decd48e64cb32aaa5903.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 在平面直角坐标系xOy中,已知A(-1,0),B(0,1),则满足|PA|2-|PB|2=4且在圆x2+y2=4上的点P的个数为( )
A.0 | B.1 |
C.2 | D.3 |
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4 . 已知直线ax+by-6=0(a>0,b>0)被圆x2+y2-2x-4y=0截得的弦长为
,则ab的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知双曲线C:
的离心率e=2,圆A的圆心是抛物线
的焦点,且截双曲线C的渐近线所得的弦长为2,则圆A的方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce21531a886c50568b75fd4278f15dcf.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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6 . 若不等式
的解集为区间
,且
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c612966c7379f43ca8652727168ec60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eb7f0759565b9d36008d49b627583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b1682d55293303a05174673f6498c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b75d8c80187ef85202d5caab62d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.![]() | B.![]() | C.2 | D.![]() |
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7 . 已知直线
与圆
恒有公共点,则以下关系式成立的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a575f18cb3508d8530535805c905fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d22c4afd75d76767cbcbc59a3a2436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 在平面直角坐标系
中,过点
的直线与圆
交于
两点,当
的面积最大时,线段
的长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bbf7acc38d391682378a7509dc04d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398a1bc39987b757434125394ab7487a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . (2016·西安西北工业大学附中训练)直线(a+1)x+(a-1)y+2a=0(a∈R)与圆x2+y2-2x+2y-7=0的位置关系是( )
A.相切 | B.相交 |
C.相离 | D.不确定 |
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10 . 如图,矩形ABCD中,AB=10,BC=5,点E,F,G,H分别在矩形ABCD各边上,且AE=CG,BF=DH,则四边形EFGH周长的最小值为( )
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358351671296/1930322234441728/STEM/f2e0b524904947438a3e25d24bb43271.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358351671296/1930322234441728/STEM/f2e0b524904947438a3e25d24bb43271.png?resizew=194)
A.5![]() | B.10![]() | C.10![]() | D.15![]() |
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