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1 . (1)解不等式组:
(2)先化简,再求值:(
-
)÷
,其中x=
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731bc155992954c7899fb0669576e594.png)
(2)先化简,再求值:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60b122e651b49f676e07bd8c815006f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76241e782e13eeee7c187507778aecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b05e238548dc202137a63d8b20ff277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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2 . 某市为给学生提供更好的体育锻炼场地和设施,计划用三年时间完成对相关学校的操场及体育设施的改造,2020年该市政府投资了3亿元,若每年投资金额的增长率相同,预计2022年的投资金额达到y亿元,设每年投资金额的增长率为x,则y=______ (用含x的代数式表示).
您最近一年使用:0次
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3 . 二次函数
为常数,
中的
与
的部分对应值如下表所示:
当
时,下列结论一定正确的是( )
①
;②
;③若点
在二次函数
的图象上,则
;④当
时,
的两根分别为
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0166102d801cc1bb81c15f4e212e91ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d209d8dfe7b17cb715c42f63c66464.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/3838d126e7480e3e0827999f3cf9f771.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce655a13dea9309f8ed84036ba293aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf495ed4d2adfd104ad5d90353b9a45b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b70fc850e0eec4580731c4d8c74849a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4561e662151983a27b3e8c8fcc857f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192b0cfd9374cb4a649d1b5376f5e718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d56d8ea1048ed42b56369d35041ecae.png)
A.①②③ | B.②③④ | C.②③ | D.③④ |
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4 . 不过原点的直线l与曲线
相切于
,相交于点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b029ff1ec707abd0d2a14b9a3d4c2082.png)
___________ .公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3daad3a31a3597f75fa109736ed2ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b029ff1ec707abd0d2a14b9a3d4c2082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2b054c81868032ddb0927b766936e2.png)
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