1 . 已知
,
与
成正比,
与x成正比.当
时,
;当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28d4f56e2fb18d89e654c65c52d8254.png)
(1)求y与x的函数关系式;
(2)当
时,求y的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845a73eeb5503d7b95dafee8dd0fece8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b8d3f7a166ff5db92d9ee0014a960d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72a5190834f5dbe895596656c038b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28d4f56e2fb18d89e654c65c52d8254.png)
(1)求y与x的函数关系式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf2917e77945b30da7be9b48b0b317a.png)
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名校
2 . 已知抛物线
,直线
.
(1)直接写出抛物线
的顶点,请问直线
是否经过该点?
(2)若
,当
时,二次函数
的最大值为
,求
的值;
(3)点
为抛物线的顶点,
为抛物线与直线
的另一个交点,当
时,若线段
(不含端点
)上至少存在一个横坐标为整数的点,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7b694c6871695078c9e6898a192b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159236c095bd66688e2e58455e740a57.png)
(1)直接写出抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd789c6b4c3100be4caaf2dc0768f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d77d121dff0c792b1935a5b4a51fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a50e8b27b6dc64883950c5fdd0a409e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c5ce1f67e05abb8e91a8ff2c371925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
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3 .
是二次函数
图象上一点,
是一次函数
图象上一点,且
,若
是
上的一点,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61defe3290bd73d6d358a3e745544826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6b45c6cbe969c6f64356f18d624537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee33caba77df20b37c63c3a567367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7f7149e797e5f49832c6c23468fab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188432484e5072404b3b4d0791edf35d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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2024-04-28更新
|
133次组卷
|
2卷引用:2023年浙江省杭州市西湖区云谷学校九年级中考数学一模模拟试题
4 . 下列函数中,图象过点
的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277f38fd04938152206161435f7e8949.png)
A.![]() | B.![]() | C. ![]() | D. ![]() |
您最近一年使用:0次
2024-04-28更新
|
132次组卷
|
2卷引用:2023年江苏省无锡市梁溪区连元英禾双语学校中考数学模拟预测题5月份)
5 . 对于一次函数
(k,b为常数),表中给出5组自变量及其对应的函数值,其中恰好有一个函数值计算有误,则这个错误的函数值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
x | 0 | 1 | 3 | ||
y | 3 | 1 | 0 |
A.![]() | B.0 | C.1 | D.3 |
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名校
6 . 直线
经过
和
,则
,
的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597df81842aedf4bb8d42a5afae29903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e00ff65fd93a4da9bcf1bfbac234e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91ab4021fbd72b6758c37b599ea74df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.![]() | B.![]() | C.![]() | D.以上都不对 |
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2024-04-18更新
|
540次组卷
|
2卷引用:四川省南充市蓬安县蓬安县第二中学2022-2023学年八年级下学期期末数学试题
7 . 如图,等腰直角
位于第一象限,
,直角顶点
在直线
上,
点横坐标为
,两条直角边
分别平行于
轴、
轴,若双曲线
与
有交点,则
的取值范围( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](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/c7385795d7eab9691e21172c51a97428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 某人打算去商店购买一盏白炽灯,到店后发现有A,B两种型号可供挑选.其中:A型号售价2元,每小时电费0.03元;B型号的总费用(售价加电费)与使用时间满足一次函数关系,当使用时间为50小时和100小时时,总费用分别为20.6元和21.2元.已知两种白炽灯的使用寿命都为2000小时.设A,B两种型号的总费用分别为
,
(单位:元),使用时间为x(单位:小时).
(1)请分别求出
,
与x的关系,并通过计算说明,当使用时间为500小时时,购买哪种型号的白炽灯比较实惠;
(2)若某人计划照明2500小时,现在购买A,B两种型号的白炽灯各一盏,请你为他设计一个最省钱的用灯方法,并求该用灯方法下的总费用.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(1)请分别求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(2)若某人计划照明2500小时,现在购买A,B两种型号的白炽灯各一盏,请你为他设计一个最省钱的用灯方法,并求该用灯方法下的总费用.
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9 . 已知
.
(1)化简T;
(2)若点
在一次函数
的图像上,求T的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d5ac3640449c77f0513ae05172b2a7.png)
(1)化简T;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a003a5de6ad7e02bbb63059b5fa818.png)
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10 . 若一次函数
的图经过点
和
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87aba319e62dd0fe1c2db30759a8ded7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10f4d985c59c189de056257862b26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fae01f5fca82cebff5bd68f573cef31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.0 | C.3 | D.4 |
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