已知
为等边三角形,点G是
的重心.过点G的直线l与线段AB交于点D,与线段AC交于点E.设
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ef4a3da53511ce0ef1b55b28b990b.png)
__________ ;
与
周长之比的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0d53573554894dbe3b31027d7cdfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c9ca024d66f87e779fee3922c3b37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ef4a3da53511ce0ef1b55b28b990b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
2022·全国·模拟预测 查看更多[4]
全国“星云”大联考2022届高三第三次线上联考数学试题(已下线)专题1平面向量线性运算 (提升版)山东省菏泽市2023-2024学年高三上学期11月期中考试数学试题(B)(已下线)专题4-2向量四心及补充定理综合归类-1
更新时间:2022-02-14 19:13:20
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【推荐1】如图,某机器人的运动轨道是边长为1米的正三角形ABC,开机后它从A点出发,沿轨道先逆时针运动再顺时针运动,每运动6米改变一次运动方向(假设按此方式无限运动下去),运动过程中随时记录逆时针运动的总路程
和顺时针运动的总路程
,x为该机器人的“运动状态参数”,规定:逆时针运动时
,顺时针运动时
,机器人到A点的距离d与x满足函数关系
,现有如下结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/6ea54f74-50f5-43b6-b54e-200611c099c7.png?resizew=127)
①
的值域为
;
②
是以3为周期的函数;
③
是定义在
上的奇函数;
④
在区间
上单调递增.
其中正确的有_________ (写出所有正确结论的编号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ab1621cd729a18b2173e95d557376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eba004c3cf1aca04c71d3c6ac00cbe.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f93eb7b09d8d1075047e126752e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4df6ac1160faa86e160be07d80e4f93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/6ea54f74-50f5-43b6-b54e-200611c099c7.png?resizew=127)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2f9766c341bc0bd1362e8e2bd9f552.png)
其中正确的有
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【推荐2】某城市的市民文体活动中心有一块扇形的绿地
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,
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【推荐1】在
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【推荐2】已知平面内不同的三点O,A,B,满足
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【推荐1】已知双曲线
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【推荐2】给定两个长度为1的平面向量
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【推荐3】过△ABC重心O的直线PQ交AC于点P,交BC于点Q,
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【推荐1】已知在平面四边形
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【推荐2】平面向量
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____________ .
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