当x___________ 时,式子
的值是非正数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60107c0ddfc7065d2f418a20e735391.png)
更新时间:2018-03-05 15:55:56
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【知识点】 求一元一次不等式的解集解读
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适中
(0.65)
【推荐1】我们规定符号
表示a、b中的较大值,如:
,按这样的规定,如果
那么x的值为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07a56316cbcee99090c5b32d3446e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608a4d8748135c0f8550ed39b8a5031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c98a204b9b45c5b1ccfe097944c9dc.png)
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填空题
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适中
(0.65)
【推荐2】如图1,将两条重合的线段绕一个公共端点沿逆时针和顺时针方向分别旋转,旋转角为
,所得的两条新线段夹角为
,以
为内角,以图中线段为边作两个正多边形,正多边形边数为n.如图2,当
时,得到两个正六边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/5b76e917-a4ee-41ef-b305-8f81a743f2ba.png?resizew=196)
(1)用含
的代数式表示
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
__________ ;
(2)边数n,旋转角
,夹角
的部分对应值如表格所示,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
__________
;
(3)若
,则n的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
边数n | 4 | 5 | 6 | … |
旋转角![]() | 90° | 108° | 120° | … |
夹角![]() | 180° | m | 120° | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/5b76e917-a4ee-41ef-b305-8f81a743f2ba.png?resizew=196)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
(2)边数n,旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6413efc6b6308b04891e16bcb69a86b.png)
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