已知直线x+y=a与圆x2+y2=4交于A、B两点,O是坐标原点,向量
满足
,则实数a的值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870621330877caa08df79df91fc4ff4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255ce71858e53114823f807458a319c7.png)
10-11高三·江苏扬州·阶段练习 查看更多[1]
(已下线)2012届江苏省扬州中学高三练习数学
更新时间:2016-12-01 01:11:57
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解题方法
【推荐1】如图:在等腰直角三角形
中,
点
为边
上靠近
点的四等分点,过点
作边
的垂线
,设点
为垂线
上任意一点,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72f967027ad688f5563a210b2022c1.png)
___________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c586b01c8da168caf1aa49ff7f531c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】由圆
外一点
引直线
交圆C于A、B两点,则线段AB中点M到x轴的距离的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf29ce633b139f8a0632a6501f2be8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383407840c52dc7878e113e3393e9780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐1】设直线
与圆
相交于
两点,若点
关于直线
对称,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d103d683d2fd06b6fa9ec5523c2ea0c9.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6767830cc1811f0f4ea5a008fdc7e723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8231aea0ffc22fc8b85bb1922659f6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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【推荐2】在平面直角坐标系xOy中,动直线kx-y=0,x+ky-2=0(k∈R)的交点P的轨迹为C.若直线l与轨迹C交于点M,N,且满足
=1,则点O到直线l的距离的平方的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c58625fd2a35ef8883b60af16bf8926.png)
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