1 . 设a,b是任意两个实数,用max{a,b}表示a,b两数中的较大者,例如max{4,3}=4,则max{
,
,
}的最小值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebf6b38a0610c823465f94224de7ca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b5a9de8a72dda70e3eefeb0a408ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd9be51fac59ed0ac89031374d29cc9.png)
A.-2 | B.1 | C.7 | D.3 |
您最近一年使用:0次
2022-03-15更新
|
460次组卷
|
5卷引用:浙江省宁波七中教育集团2021-2022学年八年级上学期期末测试数学试题
浙江省宁波七中教育集团2021-2022学年八年级上学期期末测试数学试题 浙江省宁波市2021-2022学年八年级上学期期末数学试题(已下线)专题19 和不等式(组)有关的最值问题-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(浙教版)(已下线)第08讲 不等式的基本性质与解法(7大考点)-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)浙江省宁波市北仑区北仑区顾国和外国语学校2023年八年级上学期学生发展过程性评价数学试卷(12月)
名校
2 . 对于有理数a、b,我们用符号
表示a、b两数中较小的数,如
,又
.
(1)直按写出
的值.
(2)已知
,当
时,求x的值.
(3)小明说“第(2)小题中c的值不可能是1”你认为他说得对吗?如果你认为他的观点错误,求当
时,x的值;如果你认为他的观点正确,求当
成立时,c的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf98ae4aff5b41b9356ee67ad9f562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2c464ab1b35ab351302fb4bba7634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3ebbfb6ac35dcd633c7cbf3be95f00.png)
(1)直按写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98229c50e50f8d4b012182d52058d03c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc17a4852e3f85c40ecc5b2d0c6a8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
(3)小明说“第(2)小题中c的值不可能是1”你认为他说得对吗?如果你认为他的观点错误,求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc17a4852e3f85c40ecc5b2d0c6a8c3.png)
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3 . 如图所示,某建筑工地要靠一堵院墙围建一个面积为150m2的矩形临时仓库.已知可利用的院墙长18m,要求在与院墙平行的一边开一个宽为2m的门,现有的砖料按要求只能砌成33m长的围墙,求这个待建临时仓库的长和宽.
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915415203135488/2924247091527680/STEM/a2c0ed9c-3fb1-4735-9467-bae84023f13f.png?resizew=292)
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4 . 对
,
,
定义一种新运算
,规定:
,
,
,其中
,
为非负数.
(1)当
时,若
,
,
,
,1,
,则
的值是 __ ,
的值是 __ ;
(2)若
,2,
,
,2,
,设
,则
的取值范围是 __ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ff96c7cecf3834068758b68bcce6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0d4b95d8292a52b8255fcf3fa5b8372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a783088120d67cc98936081e80fb7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c89c0525b059ab556c734fbde809baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7605a86f063089f9e12ee93896a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26e12818080e73f365a1de0f1178be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a62478e3acc589faa7d920b513ccc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26e12818080e73f365a1de0f1178be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e176b43be070c0947ed569fd88b60b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c89c0525b059ab556c734fbde809baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc3343198bc6ab8e2e493fe0d755d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e37194bf3f63e89a0986f4e8ca21e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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名校
5 . 在平面直角坐标系xOy中,将点
到x轴和y轴的距离的较大值定义为点M的“相对轴距”,记为
.即:如果
,那么
;如果
,那么
.例如:点
的“相对轴距”
.
(1)点
的“相对轴距”
______;
(2)请在图1中画出“相对轴距”与点
的“相对轴距”相等的点组成的图形;
(3)已知点
,
,
,点M,N是
内部(含边界)的任意两点.
①直接写出点M与点N的“相对轴距”之比
的取值范围;
②将
向左平移
个单位得到
,点
与点
为
内部(含边界)的任意两点,并且点
与点
的“相对轴距”之比
的取值范围和点M与点N的“相对轴距”之比
的取值范围相同,请直接写出k的取值范围.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894201679192064/2896531877658624/STEM/3b44d322-edce-4bf8-a6e8-7f13776bde01.png?resizew=291)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d259822ab64b8626f3893b8432673358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6addffcfc3b97ef2392b9bc944fe5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58a5e238a27d636636efe2cd947b74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae34a6030e245b535883829261a93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1aa23c7a7b40713c8c5e84716022a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adbd3f5cfce4eb0a0cea1fefc2f024f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2595e01e8751886a27862cce04e2d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b912992ceacd59364c9bd5c84ef901.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f40d5459e1385ab7d829ea96ca0b946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e711fdfad430a02aff0705d4a2e6b17a.png)
(2)请在图1中画出“相对轴距”与点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f40d5459e1385ab7d829ea96ca0b946.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466e8c438084aef563c6aaeff3bca583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e6975f591732cb9758fe76a2e12557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①直接写出点M与点N的“相对轴距”之比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef9cafc72c1ad56af7388c109f1424.png)
②将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6bdac20e214b2cb3bd07f8d4778dcca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3117b885d929b4a42bb4e833187031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef9cafc72c1ad56af7388c109f1424.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894201679192064/2896531877658624/STEM/3b44d322-edce-4bf8-a6e8-7f13776bde01.png?resizew=291)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894201679192064/2896531877658624/STEM/7061db68-f42c-45a7-b31c-1298c0dc2e14.png?resizew=284)
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2022-01-17更新
|
475次组卷
|
3卷引用:北京市东城区2021-2022学年八年级上学期期末数学试题
名校
6 . 已知一次函数的图像经过点
.
(1)求一次函数的表达式;
(2)若点
、
在一次函数的图像上,
,求
的取值范围;
(3)过原点
的直线恰好把
的面积分成相等的两部分,直接写出这条直线对应的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc3341314fc6ce2699f31471021df53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a682ceca64f8b53216746fb76f3e07.png)
(1)求一次函数的表达式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62f8a9aa4a163cc3561f5bd5ad20288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b54fb3e80d0a320b7fb774e3302980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)过原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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7 . 根据材料完成问题:
在含有两个字母的式子中,任意交换两个字母的位置,式子的值始终保持不变,像这样的式子我们称之为对称式,如:
,
,请解决下列问题:
①
;②
③
这3个式子中只有1个属于对称式: (请填序号);
(2)已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b206823169d517889e831da293c57c68.png)
①若
,
,求对称式
的值;
②若
,
,当
>0时,求
的取值范围.
在含有两个字母的式子中,任意交换两个字母的位置,式子的值始终保持不变,像这样的式子我们称之为对称式,如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc26b258e0552cf43a3417d4470f37c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea483675598c9074a94bf495ff6fb70a.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b206823169d517889e831da293c57c68.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87870ac160609ddf8325a07bc62eb83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc895959e9bc92294dc9dd2263dbf0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb380f9950360f72672a7893ac89655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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8 . 计算:
(1)因式分解:8a3b2+12ab3c;
(2)解不等式3x-1>2(2-5x);
(3)解方程:
.
(1)因式分解:8a3b2+12ab3c;
(2)解不等式3x-1>2(2-5x);
(3)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ebdd5ebc381974877941ae41b0af08.png)
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20-21八年级下·全国·课后作业
9 . 在0,
,3,
,
,
,4,
中,_______ 是方程
的解;_____ 是不等式
的解;_____ 是不等式
的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1bed885fcb17bdcc978ed955677f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31240f07ce78124095e1c5da1e06cc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1e5c336507bef7fcea50342a1c2073.png)
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10 . 已知:在平面直角坐标系中,直线MN与x轴、y轴交于A、B两点,点A(-6,0)、点B(0,4),点C(m,n)是直线AB上且不与A、B两点重合的动点.
(1) 求△AOB的面积
(2) 如图1,点D、点E分别是线段OB、x轴正半轴上的动点,过E作EF∥AB,连接DE.若∠ABO=x°,请探究∠BDE与∠DEF之间的数量关系.(可用含x的式子表达,并说明理由)
(3) 若2S△BOC≥3S△AOC,请求出m的取值范围
(1) 求△AOB的面积
(2) 如图1,点D、点E分别是线段OB、x轴正半轴上的动点,过E作EF∥AB,连接DE.若∠ABO=x°,请探究∠BDE与∠DEF之间的数量关系.(可用含x的式子表达,并说明理由)
(3) 若2S△BOC≥3S△AOC,请求出m的取值范围
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/cbba4db5-b2ed-46bd-b612-4862a71f141e.png?resizew=380)
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