定义运算:对任意实数
,
,总有
,例如:
,则方程
的根的情况是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc5811e600ed700707d2a739e8d10b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f31f4763cda599acafdecb91448427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a31a42a7ee61b57bcc02f586e74a08a.png)
A.有两个不相等的实数根 | B.没有实数根 |
C.有两个相等的实数根 | D.只有一个实数根 |
2023·河南周口·二模 查看更多[6]
2023年河南省周口市中考二模数学试题(已下线)第21单元03巩固练河南省南阳市六县10校联考2022-2023学年九年级下学期期中数学试题(已下线)第21章 一元二次方程(单元测试·培优卷)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)第1章 一元二次方程(单元测试·培优卷)-2023-2024学年九年级数学上册基础知识专项突破讲与练(苏科版)(已下线)第2章 一元二次方程(单元测试·培优卷)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)
更新时间:2023-06-23 10:00:18
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【推荐1】对于实数a,b,定义运算“◆”:
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【推荐2】某人将2008看成了一个填数游戏式:2□□8.于是,他在每个框中各填写了一个两位数
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【推荐1】对于一元二次方程
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①若
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②若方程
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必有两个不相等的实根;
③若
是方程
的一个根,则一定有
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其中正确的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ff52ec8dab4aaac7b28a0efe580d86.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8f898e04ae543d5d8ff87135f2c5ef.png)
②若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3583dd2c50e9161336513cc4cb3a8dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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其中正确的( )
A.①② | B.①③ | C.②③ | D.①②③ |
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【推荐2】给出下列说法,其中正确的是( )
①关于
的一元二次方程
(
≠0),若
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一定没有实数根;
②关于
的一元二次方程
(
≠0),若
,则方程
必有实数根;
③若
是方程
的根,则
;
④若
,
,
为三角形三边,方程![](https://img.xkw.com/dksih/QBM/2013/4/7/1573631346647040/1573631394406400/STEM/cb2e9565f8aa40a586f46b6ffa6ce66a.png)
有两个相等实数根,则该三角形为直角三角形.
①关于
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②关于
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![](https://img.xkw.com/dksih/QBM/2013/4/7/1573631346647040/1573631394406400/STEM/197ed6eff38b48929d601f776375c33b.png)
③若
![](https://img.xkw.com/dksih/QBM/2013/4/7/1573631346647040/1573631394406400/STEM/e97af2f13a2741fcabca3ea73d5334d8.png)
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④若
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A.①② | B.①④ | C.①②④ | D.①③④ |
您最近一年使用:0次