当m为何值时,函数y=(m﹣3)x2﹣|m|是反比例函数?当m为何值时,此函数是正比例函数?
更新时间:2019-02-25 15:28:45
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解答题-问答题
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【推荐1】某种商品上市之初采用了大量的广告宣传,其日销售量y与上市的天数x之间成正比例函数关系,当广告停止后,日销售量y与上市的天数x之间成反比例函数关系(如图所示),现已知上市20天时,当日销售量为200件.
(1)①当
时,写出该商品上市以后日销售量y(件)与上市的天数x(天)之间的函数表达式为_________.
②当
时,写出该商品上市以后日销售量y(件)与上市的天数x(天)之间的函数表达式为_________.
(2)销售经理说:至少有28天的日销售量为大于或等于100件,你同意销售经理的说法吗?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/5351c025-95da-4562-a592-e36a0321f5c7.png?resizew=146)
(1)①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bd3a4f84ab58f8b650a79abc8d3b5d.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca8c0e0a27561769848a1a21d59f6be.png)
(2)销售经理说:至少有28天的日销售量为大于或等于100件,你同意销售经理的说法吗?请说明理由.
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解答题-问答题
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【推荐2】已知y与2x-1成正比例,当x=3时,y=10
(1)求y与x之间的函数关系式;
(2)当y=-2时,求x的值.
(1)求y与x之间的函数关系式;
(2)当y=-2时,求x的值.
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解答题-作图题
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【推荐1】有这样一个问题:探究函数
的图象与性质.小怀根据学习函数的经验,对函数
的图象与性质进行了探究.下面是小怀的探究过程,请补充完成:
(1)函数
的自变量x的取值范围是 ;
(2)列出y与x的几组对应值.请直接写出m的值,m= ;
(3)请在平面直角坐标系xOy中,描出表中各对对应值为坐标的点,并画出该函数的图象;
(4)结合函数的图象,写出函数
的一条性质.
![](https://img.xkw.com/dksih/QBM/2018/11/11/2073475997507584/null/STEM/f630c03dbd8645b39e5023d9bac430c9.png?resizew=558)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae2b3d2960164e1c454e75f83ff90f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae2b3d2960164e1c454e75f83ff90f0.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae2b3d2960164e1c454e75f83ff90f0.png)
(2)列出y与x的几组对应值.请直接写出m的值,m= ;
(3)请在平面直角坐标系xOy中,描出表中各对对应值为坐标的点,并画出该函数的图象;
(4)结合函数的图象,写出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae2b3d2960164e1c454e75f83ff90f0.png)
![](https://img.xkw.com/dksih/QBM/2018/11/11/2073475997507584/null/STEM/f630c03dbd8645b39e5023d9bac430c9.png?resizew=558)
![](https://img.xkw.com/dksih/QBM/2018/11/11/2073475997507584/2074882308907008/STEM/d5060cffd8dc423caf2e63424aef6e8b.png?resizew=309)
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解答题-问答题
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【推荐2】如图,点
是平面直角坐标系的原点,直线
与反比例函数
的图象相交于点
,与反比例函数
的图象相交于点
,其中
,
.
,
的值;
(2)已知点
为
轴正半轴上的动点,过点
作
轴的垂线,交函数
的图象于点
,交函数
的图象于点
,过点
作
轴交
的图象于点
.
①连结
,
,
,
的面积是否随点
的运动变化而变化?请说明理由.
②当
与
互相垂直时,试求出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9eac411c9b4b8ec5a211bc94c9e9c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc329b32ecf0f0532d09a8a21343e8cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
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![](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/2146aec59309d1544ece1d028a17e394.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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