已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aef6cc213757f0c20e7d58ce824ca6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987039685238784/2988996014538752/STEM/a91f8b00-b494-4837-865f-d0a73e7d43bc.png?resizew=237)
(1)当
时
________;
(2)已知点
在函数图象上,则
_______;
(3)已知函数
的图象与函数
的图象关于y轴对称,我们称
为
的镜像函数.请在图中画出
,
的图象.
(4)若直线
与函数
和
的图象有且只有一个交点,则a的取值范围是_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aef6cc213757f0c20e7d58ce824ca6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987039685238784/2988996014538752/STEM/a91f8b00-b494-4837-865f-d0a73e7d43bc.png?resizew=237)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f6ae805e69e5c04728f976047dad58.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf1a6605e782f22ef670c448ed9e210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(4)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af878a885ffb4c4b339d10cde115dc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
更新时间:2022-05-28 09:50:52
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在平面直角坐标系xOy中,对于任意三点A,B,C的“矩面积”给出如下定义:“水平底”a:任意两点横坐标差的最大值,“铅垂高”h:任意两点纵坐标差的最大值,则“矩面积”S=ah.
例如:三点的坐标分别为A(1,2),B(-3,1),C(2,-2),则“水平底”a=5,“铅垂高”h=4,“矩面积”S=ah=20.
(1)已知A(-1,4),B(3,1),C(-3,-3),则“水平底”a= ,“铅垂高”h= ,“矩面积”S= ;
(2)若A(1,2),B(-3,1),P(0,t)的“矩面积”为12,求点P的坐标;
(3)若A(1,2),B(-3,1),P(0,-t),请直接写出A,B,P三点的“矩面积”的最小值.
例如:三点的坐标分别为A(1,2),B(-3,1),C(2,-2),则“水平底”a=5,“铅垂高”h=4,“矩面积”S=ah=20.
(1)已知A(-1,4),B(3,1),C(-3,-3),则“水平底”a= ,“铅垂高”h= ,“矩面积”S= ;
(2)若A(1,2),B(-3,1),P(0,t)的“矩面积”为12,求点P的坐标;
(3)若A(1,2),B(-3,1),P(0,-t),请直接写出A,B,P三点的“矩面积”的最小值.
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【推荐2】如图,在平面直角坐标系内,点
是
轴上的点,点
是
轴上的点,将
沿直线
翻折使点
落在
点处,过
点作
轴交
轴于点
,已知
.
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833568553795584/2837433181274112/STEM/20b226a3-9f7a-48b4-b536-6598f158468a.png)
(1)直接写出
、
两点的坐标.
(2)若在
轴上存在某点
,使得以
、
、
、
四点为顶点的四边形面积为40,求
点的坐标.
(3)若
点是
轴上一动点,当
为等腰三角形时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4facfc5447ae7f665e8ec050b81313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb22372c411a28a6bf56ef0f032f870.png)
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833568553795584/2837433181274112/STEM/20b226a3-9f7a-48b4-b536-6598f158468a.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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名校
【推荐3】如图,在平面直角坐标系中,点A、B的坐标分别为
,且实数a、b满足
.
(2)如图1,已知坐标轴上有两动点P,Q同时出发,P点从A点出发沿x轴负方向以每秒2个单位长度的速度匀速移动,Q点从O点出发沿y轴正方向以每秒1个单位长度的速度匀速移动,点P到达O点整个运动随之结束.
的中点C的坐标是
,设运动时间为t秒.是否存在这样的t,使得
的面积等于
面积的2倍?若存在,请求出t的值;若不存在,请说明理由;
(3)如图2,在(2)的条件下,若
,点G是第二象限中一点,并且y轴平分
,点E是线段
上一动点,连接
交
于点H,当点E在线段
上运动的过程中,探究
之间的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1e85f4edcac5ce6d19dc13f7b0b310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd62083e9bad25112afeb23447709b6.png)
(2)如图1,已知坐标轴上有两动点P,Q同时出发,P点从A点出发沿x轴负方向以每秒2个单位长度的速度匀速移动,Q点从O点出发沿y轴正方向以每秒1个单位长度的速度匀速移动,点P到达O点整个运动随之结束.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019276075c568fef2e02fc7bc0fe23c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eaf0ed8d20d6cac5d614570a5e8267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88be8fd8614cb0a4b440d41921c36c97.png)
(3)如图2,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3198526dd07350f1c2ab3a5fd0078a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5a057b40a2c7ab91a71926098027ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bdb0571d8fbf41056725230124330f.png)
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解答题-问答题
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【推荐1】已知一次函数的图象经过点
和点
.
(1)求这个函数的解析式;
(2)判断点
是否在此函数图象上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895c007904e9749908dee9795f8639d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7412078b84e2804404e079df89deccd.png)
(1)求这个函数的解析式;
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec52dacaaff63af4b2607fd92d1a2d01.png)
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解答题-作图题
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适中
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【推荐2】小平在学习过程中遇到一个函数
,下面是小平对其研究的过程,请补充完整:
(1)函数
的自变量
的取值范围是______;
(2)下表是
与
的几组对应值.
其中
的值为______;
(3)①根据表格中的数据,在平面直角坐标系
中,画出函数图象;
作平行于
轴的直线
,结合图像解决问题:若直线
与函数
的图象有三个交点,则
的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a97d1fb1a2c7b78ce244fb46e37b1c.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a97d1fb1a2c7b78ce244fb46e37b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)下表是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)①根据表格中的数据,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32bd4fbe4bc5410223f9cfef0f6e9638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a97d1fb1a2c7b78ce244fb46e37b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-作图题
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【推荐3】小明在学习函数的过程中遇到这样一个函数:
,若
时,
;若
时,
.小明根据学习函数的经验,对该函数进行了探究.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14e5871e-b714-468a-810b-5c56d93d9b52.png?resizew=226)
(1)①列表:下表列出y与x的几组对应值,请写出m,n的值
_______;
______;
②描点:在平面直角坐标系中,以①给出的自变量x的取值为横坐标,以相应的函数值为纵坐标,描出相应的点并连线,作出函数图像;
(2)下列关于该函数图象的性质正确的是_______;(填序号)
①y随x的增大而增大;②该函数图象关于y轴对称;③当
时,函数有最小值为
;④该函数图象不经过第三象限.
(3)若函数值
,则
_______;
(4)若关于x的方程
有两个不相等的实数根,请结合函数图象,直接写出c的取值范围是_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e3204e4dc47a448860779349efcedf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a585e70fd663c40dea46c5bfd2616521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62417eb1e49eb28fd0e25c953135957f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14e5871e-b714-468a-810b-5c56d93d9b52.png?resizew=226)
(1)①列表:下表列出y与x的几组对应值,请写出m,n的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
x | … | 0 | 1 | 2 | … | ||
y | … | 1 | m | ﹣1 | 0 | n | … |
(2)下列关于该函数图象的性质正确的是_______;(填序号)
①y随x的增大而增大;②该函数图象关于y轴对称;③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(3)若函数值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971751ce826c71fb6ec79969d45a9fdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(4)若关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3133aeccfe26d1ae7baed19ac5f23c.png)
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解答题-问答题
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【推荐1】如图,已知一次函数
的图象与反比例函数
的图象交于点
,
两点,与
轴交于点
.
(2)根据图象直接写出不等式
的解集;
(3)若点
与点
关于
轴对称,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e555db9f2598828e647f618b858c8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a12a3405de25a8fd489d061186d8e715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)根据图象直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c3f1c3139675a0ee0c7808a23bc721.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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解答题-计算题
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【推荐2】如图,直线
与函数
的图象相交于点
,与
轴交于点
,且
,点
是线段
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/99ad42b7-c96f-41b1-927a-d31f81c1fb65.png?resizew=169)
(1)求
的值;
(2)若
与
的面积比为
,求点
的坐标;
(3)将
绕点
逆时针旋转
得到
,点
恰好落在函数
的图像上,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707f0fb81c5dcbf009aa64b38d20e1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41ade561b91a5b71271c8c56a08de49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e223f8580b0896291b0c6e9d2358cca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/99ad42b7-c96f-41b1-927a-d31f81c1fb65.png?resizew=169)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96bcaab1157f577919c7abc73a66ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4806fb7f95f63e863c287faa51f8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142e0f0e25dc2ad81ec1a7ec6ed866b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707f0fb81c5dcbf009aa64b38d20e1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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真题
【推荐1】如图,点A(3,5)关于原点O的对称点为点C,分别过点A,C作y轴的平行线,与反比例函数
(0<k<15)的图像交于点B,D,连接AD,BC,AD与x轴交于点E(﹣2,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/353e88dc-98ea-411e-ad1e-02edcaff0d56.png?resizew=234)
(1)求k的值;
(2)直接写出阴影部分面积之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/353e88dc-98ea-411e-ad1e-02edcaff0d56.png?resizew=234)
(1)求k的值;
(2)直接写出阴影部分面积之和.
您最近一年使用:0次
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适中
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【推荐2】如图所示,已知一次函数
与反比例函数
的图象交于
、
两点.
(1)求一次函数的表达式;
(2)观察函数图象,直接写出
时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed06ccefffc165f9c77250cd28301d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083543be9dbfbc9b50dbad1723917023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f0385a34634dc389c744bd5dfe2311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f319f7e735cba5edaa8ba2fdfa7cc04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/b5961cfe-9e97-4e75-9571-6cfc956ae136.png?resizew=153)
(1)求一次函数的表达式;
(2)观察函数图象,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5df0250cb31bc215dafcb5c63800ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐3】某小学为每个班级配备了一种可以加热的饮水机,该饮水机的工作程序是:放满水后,接通电源,则自动开始加热,每分钟水温上升10℃,待加热到100℃,饮水机自动停止加热,水温开始下降,水温y(℃)与通电时间x(min)成反比例关系,直至水温降至室温,饮水机再次自动加热,重复上述过程.设某天水温和室温为20℃,接通电源后,水温y(℃)与通电时间x(min)的关系如下图所示,回答下列问题:
(1)当0≤x≤8时,求y与x之间的函数关系式;
(2)求出图中a的值;
(3)某天早上7:20,李老师将放满水后的饮水机电源打开,若他想在8:00上课前能喝到不超过40℃的温开水,问:他应在什么时间段内接水?
(1)当0≤x≤8时,求y与x之间的函数关系式;
(2)求出图中a的值;
(3)某天早上7:20,李老师将放满水后的饮水机电源打开,若他想在8:00上课前能喝到不超过40℃的温开水,问:他应在什么时间段内接水?
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189260129484800/2196642519867392/STEM/608959540f974c66a4ff18cfa1dd875b.png?resizew=216)
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