1 . 定义:在平面直角坐标系
中,已知点
,且
轴,
轴,这三个点中任意两个点之间的距离的最小值称为点
的“近距”,例如:点
的“近距”是3.
(1)已知,
.
①若A,B,C的“近距”是4,则x的值为_________;
②点A,B,C的“近距”的最大值为_________;
(2)已知点
,点
为线段
上一动点,当
,
,
的“近距”最大时,求此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75193c2de6968a93cf0bffc2f77f807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edcb410ed2b08842ef1780216b8b4df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dda88c548ca0e07daa10a479d83de9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75193c2de6968a93cf0bffc2f77f807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7b9fae7f17043ebf9fb9bedc16da74.png)
(1)已知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7121bb25c70bc5d4413bb0f24d79a25e.png)
①若A,B,C的“近距”是4,则x的值为_________;
②点A,B,C的“近距”的最大值为_________;
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171a54846ede079243b188f5f904e92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc20df18e2b839068aa2e5889b61310f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
您最近一年使用:0次
2023-07-03更新
|
138次组卷
|
3卷引用:江苏省南通市通州区2022-2023学年七年级下学期期末数学试题
江苏省南通市通州区2022-2023学年七年级下学期期末数学试题江苏省南通市通州区等2地2022-2023学年七年级下学期期末数学试题(已下线)专题02平面直角坐标系(九大类型)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(苏科版)
2 . 设函数y1=
,y2=﹣
(k>0).当﹣3≤x≤﹣2时,y1的最大值为a,y2的最小值为a+2,则实数a与k的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
A.a=3,k=1 | B.a=﹣1,k=﹣1 | C.a=3,k=3 | D.a=﹣1,k=3 |
您最近一年使用:0次
3 . 定义:关于x的一元二次方程:
与
,称为“同族二次方程”.如
与
是“同族二次方程”.若关于x的一元二次方程:
与
是“同族二次方程”.则代数式
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a48eea721a18c2c604db6e9279b3077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3688eeab4bece602fb7f6c286055fbcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee070e6bc816e645d0638bd7408f2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa84946e5dc6491a2f13c745e2f9c5a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc364f0621f70e4ddd047954f9e7a387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90acc23288778194af33c6e8fe57a5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f284aec31cdb00b1332b8bfff97a10a.png)
A.2024 | B.2023 | C.2022 | D.2021 |
您最近一年使用:0次
2023-12-04更新
|
60次组卷
|
3卷引用:贵州省贵阳市花溪区2023-2024学年九年级上学期期中数学试题
贵州省贵阳市花溪区2023-2024学年九年级上学期期中数学试题江苏省连云港市灌云县2023-2024学年九年级上学期12月月考数学试题(已下线)清单02 配方法应用的十一大经典题型(11种题型解读(40题))-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
4 . 如图,矩形窗户边框
由矩形
,矩形
,矩形
组成,且
.已知制作一个窗户边框的材料的总长是6米,设
(米),窗户边框
的面积为S(
).
(1)①用x的代数式表示
;
②求x的取值范围.
(2)求当x取何值时,S达到最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8057131f4bae6260aaeda1eb3c77fb7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e877ca1e82f435fed02d61d5bab184d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e179ae57c5f1b5ba219d78f7433ff97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c91bb20a2a0d3b59f23cf5f0d645aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e56e25b06e8512793b95b76d0d966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f793fcfa981e4e3c34c9ccb7f1861a8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/946c16f7-3bf2-4c4d-8f60-2fc346b84fe3.png?resizew=91)
(1)①用x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
②求x的取值范围.
(2)求当x取何值时,S达到最大,并求出最大值.
您最近一年使用:0次
2023-11-19更新
|
80次组卷
|
2卷引用:浙江省杭州市下城区杭州观成实验学校2023-2024学年九年级上学期期中数学试题
5 . 新定义,若关于
的一元二次方程:
与
,称为“同类方程”.如
与
是“同类方程”.现有关于
的一元二次方程:
与
是“同类方程”.那么代数式
能取的最大值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de650f865b0a3f24080348df4051bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6b6c3353d35e7e0e0cbdf86dc8f61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfb95261a60b79b561ead429bc3a086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e8148c237d0bce92c3fe0bfd98f1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b34b2e3d37bbc4cf3f213c180886712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58ad7142414635928b6026493af77f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c432745c86e6ec939f80f3bead12b5b3.png)
您最近一年使用:0次
2022-12-04更新
|
259次组卷
|
6卷引用:江苏省扬州市仪征市2022-2023学年九年级上学期期中数学试题
江苏省扬州市仪征市2022-2023学年九年级上学期期中数学试题(已下线)第02讲 一元二次方程的解法(直接开平方法、配方法3种题型)-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)(已下线)专题2.9 一元二次方程章末十大题型总结(培优篇)-2023-2024学年九年级数学上册举一反三系列(北师大版)(已下线)专题22.9 一元二次方程章末十大题型总结(培优篇)-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题1.9 一元二次方程章末十大题型总结(培优篇)-2023-2024学年九年级数学上册举一反三系列(苏科版)(已下线)专题21.9 一元二次方程章末十大题型总结(培优篇)-2023-2024学年九年级数学上册举一反三系列(人教版)
6 . 已知x+2y=5.
(1)请用含x的式子表示y;
(2)当
时,求x的最大值.
(1)请用含x的式子表示y;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eff1aaacb1ba98b5e379789f6d47a0.png)
您最近一年使用:0次
7 . 阅读下面的材料,并解答后面的问题
材料:将分式
拆分成一个整式与一个分式(分子为整数)的和(差)的形式.
解:由分母为x﹣1,可设2x2+4x﹣3=(x﹣1)(2x+m)+n.
因为(x﹣1)(2x+m)+n=2x2+mx﹣2x﹣m+n=2x2+(m﹣2)x﹣m+n,
所以2x2+4x﹣3=2x2+(m﹣2)x﹣m+n
所以
,解得
,
所以
=
=2x+6+
.
这样,分式就被拆分成了一个整式2x+6与一个分式
的和的形式,
根据你的理解解决下列问题:
(1)请将分式
拆分成一个整式与一个分式(分子为整数)的和(差)的形式;
(2)若分式
拆分成一个整式与一个分式(分子为整数)的和(差)的形式为:5m﹣11+
,求m2﹣n2+mn的最大值.
材料:将分式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6060a607a11362ee89c13d24d3739e.png)
解:由分母为x﹣1,可设2x2+4x﹣3=(x﹣1)(2x+m)+n.
因为(x﹣1)(2x+m)+n=2x2+mx﹣2x﹣m+n=2x2+(m﹣2)x﹣m+n,
所以2x2+4x﹣3=2x2+(m﹣2)x﹣m+n
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8913667af3ac9a9546fa8b876c925cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7cd8e2e29420310c0c3de3e63af448.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6060a607a11362ee89c13d24d3739e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949dddfb4e0dbcebdd08b19f191274d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bcdd2e43cd49f172c81510a2847955.png)
这样,分式就被拆分成了一个整式2x+6与一个分式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bcdd2e43cd49f172c81510a2847955.png)
根据你的理解解决下列问题:
(1)请将分式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a82a3d4002d499b5c9e121b81e590a.png)
(2)若分式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efa1af0847f7df5c59b7d85163c5ca8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45cf42b6ef0718be0da57e42a47219c.png)
您最近一年使用:0次
8 . 如图所示,在平面直角坐标系
中,点A,
,
的坐标为
,
,
,其中
,
,
满足
,
.
(1)求
,
,
的值;
(2)若
在
轴上,且
,求
点坐标;
(3)如果在第二象限内有一点
,
在什么取值范围时,
的面积不大于
的面积?求出在符合条件下,
面积最大值时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.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/ef4a90cfdbfa05577b6ec0b22739e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabe33b24e9cabf7a5530bc75d37da2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f81c1e91ae24e4af740798f1eaea29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc3b5adde543bdd99d10f0b8e32a346.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b778d2f43e5531a611c7550821846e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如果在第二象限内有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26178e9ecc496514c4a3d8ab8cb04fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/6/30/2754059361280000/2788665471655936/STEM/75ed19bb-7524-4396-a8d1-65ae0786b6f2.png)
您最近一年使用:0次
9 . 如图,直线
与
轴交于点
,直线
与
轴交于点
,抛物线
的顶点为
,且与
轴左交点为
(其中
).
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740065800011776/2745765917818880/STEM/300a7349-6a0f-4460-baa3-a3d80799adf5.png)
(1)当
时,在抛物线的对称轴上求一点
使得
的周长最小;
(2)当点
在直线
上方时,求点
到直线
距离的最大值;
(3)若把横坐标、纵坐标都是整数的点称为“整点”.当
时,求出在抛物线和直线
所围成的封闭图形的边界上的“整点”的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de45ff6478aa6609ef2a3c3f99ec09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7c87ae939ad6f32ccb5a64dd9000d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a8a971c8810b6e5e2c20df8a71e094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740065800011776/2745765917818880/STEM/300a7349-6a0f-4460-baa3-a3d80799adf5.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3877c5dd48bc7311f79a38de74a6cab4.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)若把横坐标、纵坐标都是整数的点称为“整点”.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606660b9b8fac449e6a1025ea19a281c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
10 . 已知实数
,
,满足
,
且
有最大值,则
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d8afc0f81c75859e23c71562aec49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52bb451bd2ab48292385a6a87699e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ec08be6e5edde3502faba89bb505e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f8e6a3b791eb9372f2fafcc39fa1d3.png)
您最近一年使用:0次
2021-07-28更新
|
1529次组卷
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