1 . 已知关于x,y的方程组
有下列几种说法:①一定有唯一解;②可能有无数多解;③当
时方程组无解;④若方程组的一个解中y的值为0,则
.其中正确的说法有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a485fd60816b947a91dc26979bc8f78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
A.0种 | B.1种 | C.2种 | D.3种 |
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2 . 春节是流行疾病的高发季节,为此初三1班展开以“养成良好卫生习惯,做好手部消毒”的主题班会,并在市场购买乙醇类喷雾消毒剂,其中包含100ml、200ml、300ml、500ml共四种容量不同的消毒剂.现将这四种消毒剂各取一瓶分别装到4个封装后完全相同的纸箱,并将这4个纸箱随机摆放.
(1)若小明从这4个纸箱中随机选取一个,则所选纸箱里消毒剂容量恰好为300ml的概率是______.
(2)若小明从这4个纸箱中随机选取2个,请利用列表或树状图的方法,求所选两个纸箱里消毒剂的容量之和大于400ml的概率.
(1)若小明从这4个纸箱中随机选取一个,则所选纸箱里消毒剂容量恰好为300ml的概率是______.
(2)若小明从这4个纸箱中随机选取2个,请利用列表或树状图的方法,求所选两个纸箱里消毒剂的容量之和大于400ml的概率.
您最近一年使用:0次
2024-04-02更新
|
115次组卷
|
3卷引用:江苏省盐城市毓龙路实验学校2023-2024学年九年级下学期3月月考数学试题
3 . 已知反比例函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752f80003886f8e6bdcd8e77280450.png)
(2)在所给的直角坐标系中按照“列表、描点、连线”的步骤画出这个函数的图像;
(3)观察图像,思考:在每一个象限y随x的变化是如何变化的?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752f80003886f8e6bdcd8e77280450.png)
(2)在所给的直角坐标系中按照“列表、描点、连线”的步骤画出这个函数的图像;
x | … | … | ||||||||
y | … | … |
(3)观察图像,思考:在每一个象限y随x的变化是如何变化的?
您最近一年使用:0次
4 . 如图,四边形ABCD中,
,E为射线CB上的动点,将线段AE绕A点顺时针旋转
得到
.设
的面积为S.
(1)当
时,求
的长;
(2)当
时,求S关于x的函数表达式;
(3)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be791428a8714fcaaf468d1199e4966f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbc691de48937fbce2710955a93dd31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/0e06cbe0-b1a1-45e6-bb3e-829df8223c9c.png?resizew=261)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad2b31cfb9939e45bdb29af8139af06.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
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2024-04-01更新
|
77次组卷
|
2卷引用:江苏省江阴市高新区实验学校2023-2024学年九年级下学期3月限时作业数学试题
5 . 已知,在矩形
中,
,
为边
边的中点,
为边
上一动点,连接
,过点
作
的垂线交直线
于
,分别以
为边作矩形
.
,若
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
______,矩形
为正方形:
当
时,求
的长度;
求矩形
面积的最小值.
(2)如图
,若
.当
在边
上运动时,点
也随之运动,在
运动的过程中,点
能否运动到边
上,若能,求出
的取值范围:若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a3d9038faf17f907c31af96b8a9f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3f1c63921a86b0493c0c6ba5793a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3f1c63921a86b0493c0c6ba5793a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87f9586b708869fd7186e75a75c1dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3f1c63921a86b0493c0c6ba5793a48.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0185df16d40c33c4409f0048033fb419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c741cf8348e9fa4ee6894ac2c3ac6dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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6 . 幂的运算性质在一定条件下具有可逆性,如
,则
.(a、b为非负数、m为非负整数)请运用所学知识解答下列问题:
(1)已知
,求x的值.
(2)已知:
,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a093c8f8fd0e00cd87733d99710a7034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365c09c253e67556b44111f7e9d8a1ff.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f10420ddfc3110fb9abf1101715426.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4b3c4aa43f7d3379d93039ae1031e4.png)
您最近一年使用:0次
2024-04-01更新
|
168次组卷
|
2卷引用:江苏省扬州市宝应县氾水镇初级中学2023-2024学年七年级下学期3月月考数学试题
7 . 某经销商以24元/箱的价格进了一批矿泉水,商家批发时发现在批发数量不超过100箱时,该矿泉水的批发价y(元/箱)与批发数量x(箱)之间满足如下折线段
图象.
![](https://img.xkw.com/dksih/QBM/2024/3/27/3462894630944768/3463320460992512/STEM/4d9e705a974e4b1cb25df45e75b04f08.png?resizew=167)
(1)当
时,求出此时y与x的函数关系式;
(2)求该批发商在批发出多少箱矿泉水时才能获取最大利润.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ed0a1854c79473f59d2472c8825588.png)
![](https://img.xkw.com/dksih/QBM/2024/3/27/3462894630944768/3463320460992512/STEM/4d9e705a974e4b1cb25df45e75b04f08.png?resizew=167)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a442028e1158d57eeed2b33e34316efa.png)
(2)求该批发商在批发出多少箱矿泉水时才能获取最大利润.
您最近一年使用:0次
8 . 如图是某商店在第1周—第5周销售甲、乙两种品牌空调的销量的折线统计图(单位:台).
![](https://img.xkw.com/dksih/QBM/2024/3/27/3462894630944768/3463320460754944/STEM/68c003551bf24f9cbb12b2610d87cb73.png?resizew=226)
(1)这段时间内甲品牌空调的周销量的平均数是 (台),方差是 (台2),乙品牌空调的周销量的平均数是 (台),方差是 (台2).
(2)若商店以后只打算销售一种品牌的空调,根据计算结果及折线统计图,请运用统计知识给该商店提出建议,并说明理由.
![](https://img.xkw.com/dksih/QBM/2024/3/27/3462894630944768/3463320460754944/STEM/68c003551bf24f9cbb12b2610d87cb73.png?resizew=226)
(1)这段时间内甲品牌空调的周销量的平均数是 (台),方差是 (台2),乙品牌空调的周销量的平均数是 (台),方差是 (台2).
(2)若商店以后只打算销售一种品牌的空调,根据计算结果及折线统计图,请运用统计知识给该商店提出建议,并说明理由.
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9 . 如图,正方形
中,E是
上一点,将
沿
翻折得
,点A的对应点是点F,直线
与
交于点H,与
的平分线交于点G,连接
,下列说法:①
;②
;③
的外心是定点;④若正方形边长为2,E为
的中点,则点C到直线
的距离为1.其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/990cb7bd-4c80-4dd6-861c-de5fcac6a483.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce3e9bf90869ad5a58736961890f532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2108a002331ae3c4e0ec91d82c973e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/990cb7bd-4c80-4dd6-861c-de5fcac6a483.png?resizew=163)
A.1 | B.2 | C.3 | D.4 |
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10 . 若,则
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