2018高一上·全国·专题练习
1 . 已知P(1,2)点为圆(x+1)2+y2=9的弦AB的中点,则直线AB的方程为
A.x–y–3=0 | B.x+y+3=0 |
C.x+y–3=0 | D.x–y+3=0 |
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2018高一上·全国·专题练习
2 . 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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3 . 如图,AB为⊙O的直径,BD是⊙O的切线,连接AD交⊙O于E,若BD∥CE,AB交CE于M,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4b0311cb57d78f465a57dc7f26353c.png)
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090404214185984/2094345211813888/STEM/647c1bdc-8188-4995-bad2-424c20db0e6d.png)
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4 . 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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5 . 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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6 . 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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7 . 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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8 . (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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9 . 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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10 . 如图,
是
的一条切线,切点为B,ADE,CFD和CGE都是
的割线,
.
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/23e6b1c2c22b42f9bba3de98782119d4.png)
(1)证明:
;
(2)证明:
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/5d38634d46364fc09b1c172249028741.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/9d71fc7a9711436dacdae5c4968cadf3.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/9d71fc7a9711436dacdae5c4968cadf3.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/0f73ab273346470fa702c664587ffb03.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/23e6b1c2c22b42f9bba3de98782119d4.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/f0850861173046afbddf269a796f97d9.png)
(2)证明:
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467881017344/1572467887185920/STEM/d223d506703d434b8d283bdea4e56d3a.png)
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