如图,在
中,
,
,
,P为
上任意一点,P点不与B、C重合,若
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/7e688047-feb5-4f0e-a70a-fd1e1625df5c.png?resizew=103)
(1)写出用x表示y的表达式;
(2)求自变量x的取值范围;
(3)当x为何值时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75369931b4a665aa92fba4a28136a8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1f911060adc3965f5c0c820bc94bee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/7e688047-feb5-4f0e-a70a-fd1e1625df5c.png?resizew=103)
(1)写出用x表示y的表达式;
(2)求自变量x的取值范围;
(3)当x为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df2e94ae884cf4ab8c927939861530a.png)
更新时间:2022-08-19 09:58:04
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【推荐1】小明根据学习函数的经验,对函数
的图象与性质进行了探究并解决了相关问题,请补全下面的过程.
(1)函数
的自变量
的取值范围是___________.
(2)下表是
与
的几组对应值:
写出表中
的值;
(3)如图,在平面直角坐标系
中,描出已补全后的表中各对对应值为坐标的点,画出该函数的图象;
①对于图象上两点
,若
,则
_________
(填“>”,“=”或“<”);
②当
时,若对于
的每一个值,函数
的值都大于一次函数
的值,则
的取值范围是_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9950429561aa6ddfc22d9c7fbb7199f5.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9950429561aa6ddfc22d9c7fbb7199f5.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)
| | | 0 | 1 | 2 | 3 | |||
1 | 3 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)如图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
①对于图象上两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd413eac4a977b6859cea943a96155d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d41acc47493556617fe7b9e55093d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9950429561aa6ddfc22d9c7fbb7199f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6767830cc1811f0f4ea5a008fdc7e723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】小颖根据学习一次函数的经验,对“绝对值函数”:
,
,
的图像与性质进行了研究,请将小颖的研究过程补充完成:
(1)对于函数
,
①自变量x的取值范围是_________;
②列表,找出y与x的几组对应值,完成如表:
③在图1中画出
的图像.
(2)根据
的图像,写出该函数的一条性质:_________.
(3)在图2中画出
的图像,它的对称轴是_________.
(4)在图3中画出
的图像,它可以由函数
的图像_________得到(描述图形的运动).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10306d2741184823a1784f3f26c73343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cc72ea558f216b0206bc1bb7ea3504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638f348ade850a34a3f0767aed4e6ae0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/48f81eef-d212-492c-bba3-3ba138e191d5.png?resizew=491)
(1)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10306d2741184823a1784f3f26c73343.png)
①自变量x的取值范围是_________;
②列表,找出y与x的几组对应值,完成如表:
x | … | −3 | −2 | −1 | 0 | 1 | 2 | 3 | … |
y | … | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10306d2741184823a1784f3f26c73343.png)
(2)根据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10306d2741184823a1784f3f26c73343.png)
(3)在图2中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cc72ea558f216b0206bc1bb7ea3504.png)
(4)在图3中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638f348ade850a34a3f0767aed4e6ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10306d2741184823a1784f3f26c73343.png)
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【推荐3】【教材呈现】如图是华师版八年级下册数学教材第56页的部分内容,
通过列表、描点、连线画出函数的图象如下所示:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/a2991186-001b-4a4f-8a9c-afe881c3f201.png?resizew=237)
得出结论:观察图象写出该函数的两条性质
①_______________________; ②___________________.
【学法迁移】通过列表、描点、连线画出函数
的图象并进行探索.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/9e06bff3-12a8-42b9-a4de-af09787f265a.png?resizew=237)
(1)请将上面表格补全,并在图中画出函数
的图象;
(2)根据以上探究结果,完成下列问题:
①函数
,自变量
的取值范围为________;
②函数
的图象是________图形(填中心对称图形或轴对称图形);
③直接写出当
时自变量
的值________.
例1 画出函数![]() 解 这个函数中自变量 ![]() ![]() ![]()
|
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/a2991186-001b-4a4f-8a9c-afe881c3f201.png?resizew=237)
得出结论:观察图象写出该函数的两条性质
①_______________________; ②___________________.
【学法迁移】通过列表、描点、连线画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af6a9db38b9597b8118239d686b60f7.png)
… | 1 | 2 | 3 | … | ||||||||
… | 1 | 3 | 3 | 2 | 1 | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/9e06bff3-12a8-42b9-a4de-af09787f265a.png?resizew=237)
(1)请将上面表格补全,并在图中画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af6a9db38b9597b8118239d686b60f7.png)
(2)根据以上探究结果,完成下列问题:
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af6a9db38b9597b8118239d686b60f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af6a9db38b9597b8118239d686b60f7.png)
③直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】如图1,小明家、食堂、图书馆在同一条直线上,小明从食堂吃完早餐,接着骑自行车去图书馆读书,然后以相同的速度原路返回家.如图2中反映了小明离家的距离
与他所用时间
之间的函数关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/23c5a1ae-2c21-46dd-b9de-1e9588dacdac.jpg?resizew=534)
(1)小明家与图书馆的距离为________
,小明骑自行车速度为________
;
(2)求小明从图书馆返回家的过程中,
与
的函数解析式;
(3)当小明离家的距离为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f38197c34c42e180eac825662efd62d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c058bd136fa8fe63a4ffeba041a1858.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/23c5a1ae-2c21-46dd-b9de-1e9588dacdac.jpg?resizew=534)
(1)小明家与图书馆的距离为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33319526461f78bef1f7741b825f3ff.png)
(2)求小明从图书馆返回家的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当小明离家的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c5729584c8dce7264e11704c61e199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图(1),在长方形
中,
,
,点P从A出发,沿A→B→C→D路线运动,到D停止;点Q从D出发,沿D→C→B→A路线运动,到A停止.若点P、点Q同时出发,点P速度为
,点Q的速度为
,a秒时点P、点Q同时改变速度,点P速度变为
,点Q速度变为
.图(2)是点P出发x秒后
的面积
与x秒的关系图象;图(3)是点Q出发x秒后
的面积
与x秒的关系图象.
根据题中的信息,解答下列问题
(1)根据图象得:
秒,
,
秒,
.
(2)连接
,当
第一次平分长方形
的面积时,求x的值;
(3)当点P、点Q在运动路线上相距的路程为
时,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e304742154d3ceb7767eb0e6ab29977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a37b9278b21fc0dd5e883134a2a3978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd736fbbf395fc99b5d9fa6f84940735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe7a785ff74d9aa4027bec2cdc06513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37b4a445e86ac65a31e55698983d7f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/eb1e2c73-6db5-4e3c-a14d-205dc3a3ff89.png?resizew=457)
根据题中的信息,解答下列问题
(1)根据图象得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d1461f3b7f2a8a65097c8de1dcbfc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d1461f3b7f2a8a65097c8de1dcbfc7.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)当点P、点Q在运动路线上相距的路程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998ef3b9bb67d320ce30d9b453d75469.png)
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【推荐1】已知直线y=x+6的图象与x轴、y轴交于A,B两点,直线m经过原点,与线段AB交于点C,把△AOB的面积分为1:2的两部分,求直线m的解析式.
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【推荐2】如图,在平面直角坐标系中,直线
与直线
交于点
,与
轴交于点
,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/c9f8e6df-27dc-41b9-91e7-88add9432f16.png?resizew=290)
(1)求直线
的函数表达式;
(2)在平面直角坐标系中有一点
,使得
,请求出点
的坐标;
(3)点
为直线
上的动点,过点
作
轴的平行线,交
于点
,点
为
轴上的一动点,且
为等腰直角三角形,请直接写出满足条件的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db452e9f9885c400c1824ca9e39870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6fcccae408f4eddb35ca248434c5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf784d5feef9683d237564e266cf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86acf63b2b7c89ccb8c47244b325f273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/c9f8e6df-27dc-41b9-91e7-88add9432f16.png?resizew=290)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(2)在平面直角坐标系中有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e511d8ecf566c5c0730bbe6be0d6347c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225d5dc5d7678e31b99c019ca491645a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed283a253b61df01f2a1cdc0cd8003f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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