在平面直角坐标系xOy中,点A,B在反比例函数y=
(x>0)的图象上,且点A与点B关于直线y=x对称,C为AB的中点,若AB=4,则线段OC的长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c943d7b6ce65c70e98d62e3664168ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/b19e6842-d566-42ea-8dc0-6c8072704179.png?resizew=190)
更新时间:2021-04-11 14:20:30
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【知识点】 反比例函数与几何综合解读
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【推荐1】如图,矩形
的两边
与
分别落在x轴负半轴与y轴正半轴上.反比例函数
与
分别交于
,
两点.点
为
上一点,P到直线
的距离不大于3,则点P的横坐标m的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e3fa43e765646223675ef9bbd6d2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa915a60a2d6e535369715ba84015b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4472cd8381d9ac466214846aab23c5d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1716f9ccfb6626503d70d509202cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa915a60a2d6e535369715ba84015b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/093391fd-c65b-4768-95dc-0ef1b3f4f90f.png?resizew=120)
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【推荐2】如图,点
,过
作
轴于点
,
是反比例函数
图像上一动点且在
内部,以
为圆心
为半径作
,当
与
的边相切时,点
的纵坐标是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d32261bf3ee3f6c0f4f3a52276d9b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0963f4512b335f3a2cfaeeb968a0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/d85b6653-98b4-4c12-80f7-d6bd724250cb.png?resizew=161)
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【推荐3】阅读理解:对于任意正实数a、b,∵(
)2≥0,∴a-2
,∴a+b≥2
,当且仅当a=b时,等号成立.
结论:在a+b
(a、b均为正实数)中,若ab为定值P,则a+b
,
当且仅当a=b时,a+b有最小值
.
根据上述内容,回答下列问题:
(1)若x>0,只有当x= 时,4x+
有最小值为 .
(2)探索应用:如图,已知A(-2,0),B(0,-3),点P为双曲线y=
(x>0)上的任意一点,过点P作PC⊥x轴于点C,PD⊥y轴于点D,求四边形ABCD面积的最小值,并说明此时四边形ABCD的形状.
(3)已知x>0,则自变量x为何值时,函数y=
取到最大值,最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc76e5448f87fd510fbbd0b317384a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f90b5a279b0bf105640bed83cdd3d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
结论:在a+b
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2b8353471ecc4f0d6691ce1a810e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f956919b15358142971b611e119a340.png)
当且仅当a=b时,a+b有最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c772f4f867c7f3050601f1034b6f7e6.png)
根据上述内容,回答下列问题:
(1)若x>0,只有当x= 时,4x+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d37ba3f0b96452855b6caeeb1cf746.png)
(2)探索应用:如图,已知A(-2,0),B(0,-3),点P为双曲线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168e61741a49e507fce9a9694ef31a4.png)
(3)已知x>0,则自变量x为何值时,函数y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f95b4851309268fbfa4611c86c1f7b.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1574238367686656/1574238373969920/STEM/f7ad7ebd010841ec8297aa604950b61e.png)
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