如图,在平面直角坐标系中,
为等腰直角三角形,其中
,直线
与直线
交于点A,有一个动点
沿路线
运动.
![](https://img.xkw.com/dksih/QBM/2022/12/25/3138378502668288/3156183554695168/STEM/642792d77db142ccbecae16ea0ebfcaa.png?resizew=182)
(1)求直线
的解析式;
(2)求
的面积;
(3)当
的面积是
的面积的
时,求出这时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e2857963e3ea3578e9a13638c3a2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebd1e91be8f6f55a6ff243e328afe8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbc281766c05f9245c98edb37e857e7.png)
![](https://img.xkw.com/dksih/QBM/2022/12/25/3138378502668288/3156183554695168/STEM/642792d77db142ccbecae16ea0ebfcaa.png?resizew=182)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1470425447b3997a387908aa9e89de15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158b045c6172c4178d7aa52083e1489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
21-22八年级上·宁夏银川·期末 查看更多[2]
宁夏回族自治区银川市第十五中学掌中宝2021-2022学年八年级上学期期末数学试题(已下线)20.3 一次函数的性质-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(沪教版)
更新时间:2023-01-19 14:54:47
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适中
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【推荐1】如图,直线y=ax+b与双曲线y
交于点A(2,n)和点B(﹣4,﹣2),且该直线与x轴交于点C,点D与点C关于y轴对称.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/5b117985-cbb2-4832-968a-815ca26bc370.png?resizew=240)
(1)求直线y=ax+b和双曲线y
的解析式;
(2)连接AD、BD,求△ABD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860c93fe10745d9539006b34f374ccfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/5b117985-cbb2-4832-968a-815ca26bc370.png?resizew=240)
(1)求直线y=ax+b和双曲线y
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860c93fe10745d9539006b34f374ccfd.png)
(2)连接AD、BD,求△ABD的面积.
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解答题-应用题
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适中
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【推荐2】某超市销售一种成本为30元/千克的食品,第x天的销售价格为m元/千克,销售量为n千克,下表是整理后的部分数据.
(1)直接写出m关于x的函数解析式和n关于x的函数解析式(不要求写出自变量的取值范围).
(2)当
时,求第几天的销售利润最大?最大利润是多少?
(3)如果该超市把销售价格在当天的基础上提高a元/千克(原销售量不变),那么前25天(包含第25天)每天的销售利润随x的增大而增大,请直接写出a的取值范围.
时间x/天 | 1 | 5 | 10 | 20 | … |
销售价格m/(元/千克) | 54.5 | 52.5 | 50 | 45 | … |
销售量n/千克 | 66 | 90 | 120 | 180 | … |
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4dabf55cc91c69e720012eb0d5c6cc1.png)
(3)如果该超市把销售价格在当天的基础上提高a元/千克(原销售量不变),那么前25天(包含第25天)每天的销售利润随x的增大而增大,请直接写出a的取值范围.
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适中
(0.65)
【推荐1】已知一次函数y=kx-4,当x=2时,y=-3.
(1)求一次函数的解析式;
(2)将该函数的图像向上平移6个单位,求平移后的图像与坐标轴围成的三角形面积;
(3)观察图像回答,当y 时,
.
(1)求一次函数的解析式;
(2)将该函数的图像向上平移6个单位,求平移后的图像与坐标轴围成的三角形面积;
(3)观察图像回答,当y 时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
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适中
(0.65)
【推荐2】如图,函数
与
的图象交于
.
(1)求出
、
的值;
(2)直接写出不等式
的解集;
(3)已知点
在
轴上,且
的面积是
的面积的2倍,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab0906bff33675959408a1d1b6fa823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe22d0cee40ad652466d25d9e7c9264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47c650a75fb495d8d28a8cc6102aa83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/32e1a5cb-d2e6-4dd3-8187-0d4710c28322.png?resizew=224)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa28d8bbfc7fe4344133de2be50f5a6f.png)
(3)已知点
![](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/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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适中
(0.65)
【推荐1】在等腰
中,
,
边上的中线
把
的周长分为15和17两部分.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/cef47d58-93e5-452c-8648-7212f0a05d92.png?resizew=120)
(1)求
和
的长;
(2)若
,且点
到
边的距离为4,求点
到
边的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/cef47d58-93e5-452c-8648-7212f0a05d92.png?resizew=120)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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名校
【推荐2】如图,已知
中,
,
,
,P、Q是
边上的两个动点,其中点P从点A开始沿
方向运动,且速度为每秒
,点Q从点B开始沿
方向运动,且速度为每秒
,它们同时出发,设出发的时间为t秒.
的长;
(2)当点Q在边
上运动时,出发几秒钟后,
能形成等腰三角形?
(3)当点Q在边
上运动时,求能使
成为等腰三角形的运动时间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e04947c608f4b7f67b18e8decb05f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7012d1ff11db5e150182e19646814cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当点Q在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
(3)当点Q在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92905d020164683947943040ec19c530.png)
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