已知a,b是方程
的两个实数根,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00af836e8f77cb8d353d104ec8412ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a9c1779c83c1db8079abdf0a5ea021.png)
A.![]() | B.![]() | C.![]() | D.![]() |
22-23九年级上·山东枣庄·期中 查看更多[2]
更新时间:2022-12-28 15:05:08
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【推荐2】把两张形状大小完全相同的小长方形卡片(如图1)不重复地放在一个底面为长方形(长为
,宽为
)的盒子底部(如图2),盒子底面未被卡片覆盖的部分用阴影表示.则图2中两块阴影部分周长的和是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/d4e03542-06aa-4ffb-a070-403dac2be6b1.png?resizew=241)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/d4e03542-06aa-4ffb-a070-403dac2be6b1.png?resizew=241)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】若
是方程
的根,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99606defee81cacc6652482953b6818c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9662adeff43e8e82f7e9073b2d9533ae.png)
A.2021 | B.2024 | C.2027 | D.2030 |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】对于下列结论:
①二次函数
,当
时,
随
的增大而增大.
②关于
的方程
的解是
,
(
、
、
均为常数,
),则方程
的解是
,
.
③设二次函数
,当
时,总有
,当
时,总有
,那么
的取值范围是
.
其中,正确结论的个数是( )
①二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75217e13e2a4445061e08c5541b492c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1852448a8b56a2ff23d1a797de43502e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de10eb4cf291d00db3bb92596143afa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eba583e37243f3ba166bd1c11e58498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95f215b60234fa5cdc1d7203263b053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de10eb4cf291d00db3bb92596143afa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eba583e37243f3ba166bd1c11e58498.png)
③设二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a79d7f73b6128650bf7aed538260c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc65d6eb9b63f96d80b54ec9893aee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00879cffccc124857ca755a8c345e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d462ed4ec22e8fe51f09eb30e8792532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7165c012456e5fe91f2f8eb0a7df3ef.png)
其中,正确结论的个数是( )
A.0个 | B.1个 | C.2个 | D.3个 |
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【推荐1】若一元二次方程ax2﹣c=0(ac>0)的两个根分别是n+1与2n﹣4,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b246aa3b56becc905d3fb64c6d5ec4a.png)
A.﹣2 | B.1 | C.2 | D.4 |
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