对于每个非零自然数n,抛物线
与x轴交于
,
两点,以
表示这两点之间的距离,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4918d3bc6a6a247b329f4c573b216f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374cb268ffa23fc0bf12c6e6dc873c4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b193e94cabfb15c1d992cf08b275f4e.png)
A.![]() | B.![]() | C.![]() | D.1 |
更新时间:2021-04-06 19:01:18
|
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单选题
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适中
(0.65)
【推荐2】
是方程
的一个实数根,则
分别是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ddca70b3c93ce81065aae69504d1b1.png)
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A.0,2 | B.0,-2 | C.不能确定,2 | D.不能确定,-2 |
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单选题
|
适中
(0.65)
名校
【推荐1】二次函数
的部分对应值如下表:
则关于
的一元二次方程
的解为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b800b7d6a688abf8a3018c133cec9e.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
单选题
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【推荐2】如图一段抛物线:
,记为
,它与x轴交于点O和
;将
绕
旋转
得到
,交x轴于
;将
绕
旋转
得到
,交x轴于
,如此进行下去,直至得到
,若点
在第8段抛物线
上,则m的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/333cf8b4-35e1-4b38-a16c-0a563213cde2.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377f72789c67ec9765fbb97e8675e4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c1c04043c0ebb992abe030d3effcad.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d2fad41344a7289393deb92623eddb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/333cf8b4-35e1-4b38-a16c-0a563213cde2.png?resizew=191)
A.1 | B.-1 | C.2 | D.-2 |
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