如图1,动点P从点B出发,以
的速度按
的路径移动到点A停止,相对应的
的面积
与时间
的函数图象如图2所示.已知
,请仔细观察图象并解答以下问题:
的长度是__________
;
(2)求出图2中a、b的值;
(3)求当P在线段
上运动时,
的面积S与t的函数关系式,并确定此时自变量的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1950e3224931a713a10c9c32740ddd2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb194fd63b75af067ba10dee7471d299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)求出图2中a、b的值;
(3)求当P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
更新时间:2024-05-25 14:19:29
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【推荐1】在一条公路上依次有
,
,
三地,甲车从
地出发,驶向
地,同时乙车从
地出发驶向
地,到达
地停留0.5小时后,按原路原速返回
地,两车匀速行驶,甲车比乙车晚1.5小时到达
地.两车距各自出发地的路程
(千米)与时间
(小时)之间的函数关系如图所示.请结合图象信息解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/2f3c5096-b8c3-4410-bc13-028e7d1c6dd1.png?resizew=312)
(1)甲车行驶速度是______千米/时,
,
两地的路程为______千米;
(2)求乙车从
地返回
地的过程中,
(千米)与
(小时)之间的函数关系式(不需要写出自变量
的取值范围).
![](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/5963abe8f421bd99a2aaa94831a951e9.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/7f9e8449aad35c5d840a3395ea86df6d.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/2f3c5096-b8c3-4410-bc13-028e7d1c6dd1.png?resizew=312)
(1)甲车行驶速度是______千米/时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求乙车从
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图所示是某港口从上午8 h到下午8 h的水深情况,根据图象回答下列问题:
(1)在8 h到20 h,这段时间内大约什么时间港口的水位最深,深度是多少米?
(2)大约什么时候港口的水位最浅,是多少?
(3)在这段时间里,水深是如何变化的?
(1)在8 h到20 h,这段时间内大约什么时间港口的水位最深,深度是多少米?
(2)大约什么时候港口的水位最浅,是多少?
(3)在这段时间里,水深是如何变化的?
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【推荐1】如图1,AB是半圆O的直径,点C是直径AB上一动点,点D是直径AB下方一定点,且∠BAD=60°,AD=3cm,AB=6cm,连接DC并延长交
于点P,连接AP,BD. 设AC=xcm,AP=y1cm,PD=y2cm,小明同学根据学习函数的经验,分别对y1,y2随自变量x的变化而变化的规律进行了探究;下面是小明同学的探究过程,请补充完整:
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941549700734976/2942571777802240/STEM/8f0cf223-c0a3-4d9d-853b-fcd5a92330e1.png?resizew=461)
(1)根据点C在直径AB上的不同位置,画出相应的图形,测量线段AC,AP,PD的长度,得到了y1,y2与x的几组对应值,如下表所示:
请补全表格:a的值为 .
(2)在同一平面直角坐标系xOy图2中,描出补全后的表中各组数值所对应的点(x,y1),(x,y2),并画出函数y1,y2的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941549700734976/2942571777802240/STEM/8f0cf223-c0a3-4d9d-853b-fcd5a92330e1.png?resizew=461)
(1)根据点C在直径AB上的不同位置,画出相应的图形,测量线段AC,AP,PD的长度,得到了y1,y2与x的几组对应值,如下表所示:
x/cm | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
y1/cm | 0 | 1.98 | 3.95 | 5.19 | 5.77 | 5.97 | 6.00 |
y2/cm | a | 4.55 | 5.68 | 6.00 | 5.83 | 5.51 | 5.20 |
(2)在同一平面直角坐标系xOy图2中,描出补全后的表中各组数值所对应的点(x,y1),(x,y2),并画出函数y1,y2的图象.
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【推荐2】如图1,矩形
中,E是对角线
上一个动点(不与点A重合),作
,交
于点F,联结
,如果设
,
面积为y,那么可得y关于x的函数图像(如图2所示).
(2)求
的面积及矩形对角线
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】(1)已知一次函数的图像过点
与
,求这个一次函数的解析式.
(2)已知
与
成正比例,当
时,
.试求
与
的函数关系式,并求出当
时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c39c16d3c056a9627afbc9501e3f8b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50d1a6eb90a60f6b971f900c08ad908.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ff1fb0427bad73010eac184843b062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8314e2f98928b76d7fb74b09283f3db.png)
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【推荐2】环保局对某企业排污情况进行检测,结果显示:所排污水中硫化物的浓度超标,即硫化物的浓度超过最高允许的
.环保局要求该企业立即整改,在15天以内(含15天)排污达标.整改过程中,所排污水中硫化物的浓度
与时间
(天)的变化规律如图所示,其中线段
表示前
天的变化规律,从第3天起,所排污水中硫化物的浓度
与时间
成反比例关系.
![](https://img.xkw.com/dksih/QBM/2023/1/27/3161990971408384/3163938387509248/STEM/03b76448947346628e03448f1fdedd4d.png?resizew=197)
(1)求整改过程中硫化物的浓度
与时间
的函数表达式;
(2)该企业所排污水中硫化物的浓度,能否在15天以内不超过最高允许的
?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026e2333a12e1accbf476159edabdd36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d2136671d70443705e7dd2081b0f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2023/1/27/3161990971408384/3163938387509248/STEM/03b76448947346628e03448f1fdedd4d.png?resizew=197)
(1)求整改过程中硫化物的浓度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)该企业所排污水中硫化物的浓度,能否在15天以内不超过最高允许的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026e2333a12e1accbf476159edabdd36.png)
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【推荐1】由两块
的长方形和一块边长为
的正方形拼成如下图案书加下图形
(1)如图1,用含
、
、
的式子表示出该图形的面积(直接写出结果)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/3630a1dc19cf4c0db053da0272ef643d.png?resizew=195)
图1
(2)已知
,
.
①如图2,分别用两种不同的方式连接图形中的二个顶点,得到如图所示的两个阴影三角形,这两个阴影三角形的面积分别记作
和
,试通过计算比较
与
的大小关系;
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/e8867b30e5e043708efa4fb2ba335435.png?resizew=428)
图2
②如图3,Р是边长为
的正方形四条边上的一个动点,M、N 是图形上如图中所示的两个顶点,则三角形PMN面积的最大值为____________;三角形PMN面积的最小值为_________(用含
的式子表示)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/2d82130328094515822d7599cca5c9ff.png?resizew=273)
图3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b98b248f3c184b8c8797e99c2cf924ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(1)如图1,用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/3630a1dc19cf4c0db053da0272ef643d.png?resizew=195)
图1
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
①如图2,分别用两种不同的方式连接图形中的二个顶点,得到如图所示的两个阴影三角形,这两个阴影三角形的面积分别记作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/e8867b30e5e043708efa4fb2ba335435.png?resizew=428)
图2
②如图3,Р是边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaab0619213938b7f55769c7540abdf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2844111133417472/2848147068313600/STEM/2d82130328094515822d7599cca5c9ff.png?resizew=273)
图3
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【推荐2】经过点B(2,0)的直线l1与直线l2:y=2x+8相交于点P(﹣1,n).
(1)请求出n的值;
(2)试求出PB的长度.
(3)试求出直线l1,直线l2与x轴所围成的三角形面积.
(1)请求出n的值;
(2)试求出PB的长度.
(3)试求出直线l1,直线l2与x轴所围成的三角形面积.
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868632264450048/2869490064187392/STEM/2ddac43f-599c-45a9-8c4a-8872793bdcc0.png?resizew=186)
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