设集合
,证明:对任意
,都存在
和正整数
使得
,其中,
表示不超过实数
的最大整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08529a9da4863a1cde8a8ad89bdf7531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb8dc6eb2d22e07ee5108746161eba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa58f46ec759a37cbe9852e2308da358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
2019高三·全国·竞赛 查看更多[1]
更新时间:2018-12-28 19:01:06
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适中
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【推荐1】设集合
,
.①若
,
,求a、b的值;②若
,且
,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae6514339ef6fac934437d25ed39825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4301ff6240e49c7113dd972d0ca324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d97179ceae3e5f249493badc94e2c9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3df2615ad605d88b82989dd9b3968df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c206492a22cf5833fb283391eb45e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2801c9356c01b3997f449fe60bb1cc3f.png)
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【推荐2】将边长为3的正
的各边三等分,过每个分点分别作另外两边的平行线,称
的边及这些平行线所交的10个点为格点.若在这10个格点中任取
个格点,一定存在三个格点能构成一个等腰三角形(包括正三角形).求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】在正2018边形的每两个顶点之间均连一条线段,并把每条线段染成红色或蓝色.求此图形中三边颜色都相同的三角形的最小个数.
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【推荐2】圆周上有
个点
,用弦两两连结起来,其中任何3条弦都不在圆内共点.现将由此形成的互补重叠的圆内区域的个数记为
.
(1).直接画图求出
,
,
,
,
;
(2).确定
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e276e27bee0f5274ecfd945d393e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
(1).直接画图求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5ca241bb7c313ef0366d3ddba93bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbeed5324c432101be517dd6f5c735b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d199f9235e3bd36bfa78c3772e941896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaf542829b99205948fa97442c3db92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c2f981c2c9d55dbea8172ff5ccf0db.png)
(2).确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
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