如图,在ABC中已知
,且BC延长线上的点D足
,则
的最大值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ddf328806ab2cbe040b70ba3523edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48119b3932497634478f656c752ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0e1496d7-98be-4e62-9203-4735cba3e96b.png?resizew=131)
更新时间:2020-05-15 09:18:41
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【推荐1】已知集合
.由集合P中所有的点组成的图形如图中阴影部分所示,中间白色部分形如美丽的“水滴”.给出下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/546ffe49-80fc-41f8-9f06-79fbbd807664.png?resizew=220)
①“水滴”图形与y轴相交,最高点记为A,则点A的坐标为
;
②在集合P中任取一点M,则M到原点的距离的最大值为4;
③阴影部分与y轴相交,最高点和最低点分别记为C,D,则
;
④白色“水滴”图形的面积是
.
其中正确的有___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9bfbdd3a6e4919b86df44a0e22c2e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/546ffe49-80fc-41f8-9f06-79fbbd807664.png?resizew=220)
①“水滴”图形与y轴相交,最高点记为A,则点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0913f2ab13b39b1dae508b352a542d5.png)
②在集合P中任取一点M,则M到原点的距离的最大值为4;
③阴影部分与y轴相交,最高点和最低点分别记为C,D,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af61a4fdc65350b63bc89b462021cd7.png)
④白色“水滴”图形的面积是
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其中正确的有
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【推荐2】
、
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是函数
的图象上不重合的三点,若函数
满足:当
时,总有
、
、
三点共线,则称函数
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①一次函数都是“零和共线函数”;
②二次函数都不是“零和共线函数”;
③存在
,使得
是“零和共线函数”;
④对任意
,
都是“零和共线函数”.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
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①一次函数都是“零和共线函数”;
②二次函数都不是“零和共线函数”;
③存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48869f39b255cff0f5c429ec1ab6d167.png)
④对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3af3d7649ec1d66bce58b8493aa95a7.png)
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【推荐3】记
的内角
,
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的取值范围为________ .
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【推荐1】平面四边形
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,
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【推荐2】在△ABC中,∠BAC=
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____________ .
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【推荐1】已知锐角
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【推荐2】如图,
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,
,则四边形
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