名校
解题方法
1 . 已知平面上三点A,B,C的坐标依次为
,
,
.
(1)若
为直角三角形,且角A为直角,求实数k的值;
(2)在(1)的条件下,设
,
,若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed37520eb88c41828ad26f0a2b2de971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47fa19dde2fb0cc8274390a05a6095cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00999ca76efc3763c13c6b4260c4498.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e49d2c72a35f1ce4d1d26574934a014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a303aee4aea8d84cfa947002b0eaeb1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768434e9275596ec3f60ec46454a16e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbae94f2dd5086f7ddbe18407a978e9b.png)
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2020-03-03更新
|
729次组卷
|
4卷引用:山东省菏泽市东明县第一中学2018-2019学年高一下学期期中数学试题
2 . 已知
是定义在
上的函数,如果存在常数
,对区间
的任意划分:
,和式
恒成立,则称
为
上的“绝对差有界函数”。注:
。
(1)证明函数
在
上是“绝对差有界函数”。
(2)证明函数
不是
上的“绝对差有界函数”。
(3)记集合
存在常数
,对任意的
,有
成立
,证明集合
中的任意函数
为“绝对差有界函数”,并判断
是否在集合
中,如果在,请证明并求
的最小值;如果不在,请说明理由。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804319e6cb58f07ee82ee364e334f36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bba359204c3a83c5094e9bc09e4f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2955a1ae6ca7b3a7c9fd5b3e7bdc09.png)
(1)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587882ac081850caa4447c44a7dbb845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e4b97703638756a4051a3dd0cdcf5a6.png)
(2)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf20df06f5ff3e00e38f3e257f2ea6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
(3)记集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2130dde27163d8ae5a28aae9467e24b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f20b947d584a1dc48676c2ae6e2af52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9bc59028761bee9de313ee6d5decc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ba29e6b864f89b4772130b6dc87427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa611cda56d55165309bdfbbf58240c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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