1 . 函数
的定义域是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a7068208a304bba39152e4f1a6725f.png)
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2 . 写出下列函数中自变量
的取值范围:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e84801c624273c969392f5f45c7646.png)
________ ;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625b54050cd34833c8f92e3b20538c00.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e84801c624273c969392f5f45c7646.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625b54050cd34833c8f92e3b20538c00.png)
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3 . 函数
的定义域为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8127f7dcb437ef5957ffe732c6149d9b.png)
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4 . 用解析式表示下列函数,并指明自变量
的取值范围.
(1)某食堂有白菜1500千克,求这些菜能吃的天数
与这食堂每天平均吃菜的千克数
之间的关系式;
(2)某种钢笔5元一支,求买钢笔的钱数
(元)与买钢笔支数
之间的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)某食堂有白菜1500千克,求这些菜能吃的天数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)某种钢笔5元一支,求买钢笔的钱数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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5 . 求下列函数的定义域:
(1)
;
(2)
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9863ac5bfd6eafc726c9240f54385504.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bbfac5e8cceaa04d1c57012740079e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea50fa9bf01720f5b7c1320c09c851d.png)
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6 . 函数
的定义域是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e859a6eda75373b63b02517d05a305.png)
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7 . 等腰三角形顶角为
度,底角为
度,则
,
之间的函数关系式是______ ,定义域是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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8 . 若矩形面积是100平方厘米.长为
厘米,宽为
厘米,则
与
之间的关系式是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 求下列函数的定义域:
(1)
; (2)
;
(3)
; (4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed679bc5d5021f56bcca3822243a5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2a54ee71fb00777a444a1c0416db6b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569c03ec9abc4aa356e316495e260865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37676d4e7710fd874ffdf69bb9f99715.png)
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10 . 求函数定义域:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabb17492f10f6c0f2da993668317306.png)
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