21-22高一·湖南·课后作业
解题方法
1 . 某市对家庭每月用水的收费规定为:若用水量不超过基本月用水量
,则只付基本费8元和损耗费
元(
);若用水量超过基本月用水量,则除了需付基本费和损耗费外,超过部分还需按
元
进行付费.已知该市某家庭1—3月的用水量分别为
,
和
,其支付的费用分别为9元,19元和33元.试写出每月支付费用
(元)关于月用水量
的函数,并画出函数的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf090346d9e8610df47cd19950736998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00d5d0f323a78951ceb046e68f6e892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91293ad12c4d0812604f29af9bc2aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70e55f816b182201ad9a62e86d0b4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fa882483eec61b3394edc3548211af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fe783f10311be4e71e098027d9d2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85989d362a00eff3b940d6472cb40e0.png)
您最近一年使用:0次
解题方法
2 . 已知函数
,
(
为常数且
),且
的图像经过点
.
(1)求正实数
的值;
(2)设
,若函数
的图像都在
轴的上方,求实数
的取值范围;
(3)设
,画出函数
的图像(坐标系中小方格的边长为1),并写出它的单调区间和值域(无需证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8944834385332001a50dbf8449caa34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6b61e4905ec8bcc47bb881b5006743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
(1)求正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e276948336429b65001994babd2a0c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c577b13117a5dfdcb3b64baef16aafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4d45cb4978b543ae6a3ac9bf91f409.png)
您最近一年使用:0次