名校
1 . 抛物线
的顶点为
,与
轴的一个交点
在点
和
之间,其部分图片如图,则以下结论:
①
;②
;③
;④方程
有两个相等的实数根.
其中正确结论的个数为
![](https://img.xkw.com/dksih/QBM/2017/10/21/1800269217505280/1801308158894080/STEM/b7da4b02a39b4a1793666eb2bd490648.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4266e55d88908b64f3d90a9ae7abf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079dd115a4b8cbc93918a853363786dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc8350b12974ffc8d06fce36d158f02.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669823dbe5e8f4e29ef791b3d17b0399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65cc9c2b83f2e321ef86e353340ce8e.png)
其中正确结论的个数为
![](https://img.xkw.com/dksih/QBM/2017/10/21/1800269217505280/1801308158894080/STEM/b7da4b02a39b4a1793666eb2bd490648.png?resizew=195)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
名校
2 . 已知
,
,
,记
的外接圆为
.
(1)求
的方程.
(2)对于线段
上的任意一点
,是否存在以
为圆心的圆,在圆
上总能找到不同的两点
,满足
,若存在,求圆
的半径
的取值范围;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d68d8414378c97e7a7be7d0f2fc461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afa449704e958da31f8ddc8897a6d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a57ac9577e017b0ff5fcd931d379be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
(2)对于线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261322163648e3713e759b91a0c0fbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
您最近一年使用:0次