解题方法
1 . 若
是定义在
上的增函数,且对任意
,满足
,已知
.
(1)解不等式
;
(2)若
,求
的解析式,并在如图所示的平面直角坐标系中画出函数
在区间
上的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d43b263c92bb6d818fa5cdbe60bf66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2dec9053c9d6608fa34b48afc23d04.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4fb96fd9a828b30fd675ed0ebdbaa8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecacb2ed8f8af71d6a42954faa20e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6963d9b735753d8c6ac3bd6c95a4c43f.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792321355227136/1792395243995136/STEM/36e4fef3d9094d4cb0670d2290509144.png?resizew=372)
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2 . 某货运公司规定,从甲城到乙城的计价标准是:40吨以内100元(含40吨),超出40吨的部分4元/吨.
(1)写出运费
(元)与货物重量
(吨)的函数解析式,并画出图象;
(2)若某人托运货物60吨,求其应付的运费.
(1)写出运费
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0d46da745fa5e71ea97e7b30beb6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
(2)若某人托运货物60吨,求其应付的运费.
![](https://img.xkw.com/dksih/QBM/2017/2/20/1628011132821504/1629087363153920/STEM/0f18e2579205456eb0476aa44bfbf589.png?resizew=209)
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