2018高一上·全国·专题练习
1 . 直线l:2mx–y+2–2m=0与圆C:x2+(y–1)2=5的位置关系是
A.相交 | B.相切 | C.相离 | D.不确定 |
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2 . 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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3 . 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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4 . 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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5 . 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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6 . (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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7 . 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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2018高三下·全国·专题练习
8 . 已知圆
过点
,直线
与圆
交于
两点,直线
与圆
交于
两点,若
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f1edf7cfa369d5369dbcf5416f08a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102da243d031c465c687139fc7282a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af433d436540b38519cb41614849bb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9312421c2ac57f5a01860ade74380df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2018高三下·江苏·专题练习
9 . [选修4-1:几何证明选讲]
如图,AD,BC,CD是以AB为直径的圆的切线,切点分别为A,B,P,AC和BD交于Q点.
![](https://img.xkw.com/dksih/QBM/2018/5/15/1945762290966528/1946605564076032/STEM/9b86f66031854c81883fbbe33e8de2f5.png?resizew=170)
求证:
.
如图,AD,BC,CD是以AB为直径的圆的切线,切点分别为A,B,P,AC和BD交于Q点.
![](https://img.xkw.com/dksih/QBM/2018/5/15/1945762290966528/1946605564076032/STEM/9b86f66031854c81883fbbe33e8de2f5.png?resizew=170)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
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