若函数
是反比例函数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe547d8878a0fdfa6e640edd94c9770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2016-12-06 01:14:58
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【知识点】 根据反比例函数的定义求参数解读
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解答题-应用题
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【推荐1】某商贩出售一批进价为l元的钥匙扣,在销售过程中发现钥匙扣的日销售单价x(元)与日销售量y(个)之间有如下关系:
![](https://img.xkw.com/dksih/QBM/2019/8/27/2277683434053632/2278012208668672/STEM/527edb08b7a24af3a6126927a8901037.png?resizew=479)
![](https://img.xkw.com/dksih/QBM/2019/8/27/2277683434053632/2278012208668672/STEM/eacf185936604adbb17eb790f845b32b.png?resizew=197)
(1)根据表中数据在平面直角坐标系中,描出实数对(x,y)对应的点;
(2)猜想并确定y与x的关系式,并在直角坐标系中画出x>0时的图像;
(3)设销售钥匙扣的利润为T元,试求出T与x之间的函数关系式:若商贩在钥匙扣售价不超过8元的前提下要获得最大利润,试求销售价x和最大利润T.
![](https://img.xkw.com/dksih/QBM/2019/8/27/2277683434053632/2278012208668672/STEM/527edb08b7a24af3a6126927a8901037.png?resizew=479)
![](https://img.xkw.com/dksih/QBM/2019/8/27/2277683434053632/2278012208668672/STEM/eacf185936604adbb17eb790f845b32b.png?resizew=197)
(1)根据表中数据在平面直角坐标系中,描出实数对(x,y)对应的点;
(2)猜想并确定y与x的关系式,并在直角坐标系中画出x>0时的图像;
(3)设销售钥匙扣的利润为T元,试求出T与x之间的函数关系式:若商贩在钥匙扣售价不超过8元的前提下要获得最大利润,试求销售价x和最大利润T.
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【推荐2】在平面直角坐标系
中,反比例函数
的图像与正比例函数
的图像相交于点
,且点
的横坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/0cd9746a-f3bd-4c4f-aaa5-1be5da03ed75.png?resizew=177)
(1)求这个正比例函数的解析式;
(2)已知点
在这个正比例函数的图像上,且在点
上方,直线
轴,交反比例函数
的图像于点
,交
轴于点
,如果点
恰好是
的中点,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498bcfd1aac03057dcd0adef2dd113a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/0cd9746a-f3bd-4c4f-aaa5-1be5da03ed75.png?resizew=177)
(1)求这个正比例函数的解析式;
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2146aec59309d1544ece1d028a17e394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498bcfd1aac03057dcd0adef2dd113a3.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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