如图,二次函数
的图象与x轴交于A,B两点,与y轴的正半轴交于点C,它的对称轴为直线
.有下列结论:①
;②
;③
;④当
时,
;⑤若
、
(
)是方程
的两根,则方程
的两根m、n(
)满足
,且
.其中,正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/1a857756-fb8e-4c9a-bcf2-843c4f219663.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0c865c1f8d424665e0f756aa600ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b0565d67e34dbaae761ecc1db0a50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855434f4d77ab61d0bdadc62b0f89077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6562cac235ba81a5472e18fffac4cc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289c5daf61bc5139fddb72f9e0a5daab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08177de772303510e6765e894e031e3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c329a8b737d00c8afb1b023affa56f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/1a857756-fb8e-4c9a-bcf2-843c4f219663.png?resizew=152)
A.1 | B.2 | C.3 | D.4 |
21-22九年级上·四川自贡·期末 查看更多[9]
四川省自贡市2021-2022学年九年级上学期期末数学试题四川省巴中市巴中中学2021-2022学年九年级下学期3月月考数学试题2022年山东省日照市新营中学中考二模数学试题2022年山东省威海市临港区中考一模数学试题2023年山东省泰安东岳中学中考二模数学试题广东省惠州市惠城区南山学校2022-2023学年九年级下学期开学考试数学试题河北省邯郸市永年区育英学校2022-2023学年九年级上学期第二次月考数学(实验班)试题四川省自贡市富顺县西区九年制学校(富顺县安和实验学校)2023-2024学年九年级上学期第三次月考(12月)数学试卷2024年山东省日照山海天旅游度假区青岛路中学九年级二模考试数学试题
更新时间:2022-03-11 09:37:52
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【推荐1】如图是二次函数
的图象,有如下结论:①
;②
;③
:④
.其中正确的结论有( )个
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A.1 | B.2 | C.3 | D.4 |
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【推荐2】已知点
都在二次函数
(a是常数,且
)的图象上,则
的大小关系是( )
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名校
【推荐1】二次函数y=ax2+bx+c的部分图象如图所示,对称轴是直线x=﹣1.5,与x轴的一个交点在(﹣4,0)和(﹣3,0)之间,有以下结论:①abc>0;②b2﹣4ac>0;③3a﹣b=0;④4b+3c<0.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/99ccb204-b313-4f2d-a0b0-de857b933725.png?resizew=263)
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【推荐2】抛物线
(a,b,c为常数,
)经过
,
两点.则下列四个结论正确的有( )
①
;②
;③若该抛物线
与直线
有交点,则a的取值范围是
;④对于a的每一个确定值,如果一元二次方程
(t为常数,
)的根为整数,则t的值只有3个.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e8ebd1d7fc0e20a1de79ed02516e7c.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,在平面直角坐标系
中,抛物线
与x轴交于A、B两点(点A在点B的左侧),点
与y轴相交于点
,下列结论:①
;②B点坐标为
;③抛物线的顶点坐标为
;④直线
与抛物线交于点D、E,若
,则m的取值范围是
;⑤在抛物线的对称轴上存在一点P,使
的周长最小,则P点坐标为
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【推荐2】如图,抛物线y=ax2+bx+c(a≠0)的对称轴为直线x=1,与x轴的一个交点坐标为(﹣1,0),其部分图象如图所示,下列结论:
①4ac<b2;
②方程ax2+bx+c=0的两个根是x1=﹣1,x2=3;
③3a+c>0
④当y>0时,x的取值范围是﹣1≤x<3,其中结论正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845231205990400/2846335424397312/STEM/652158f58280421e9cabf6f604ad7b79.png?resizew=139)
①4ac<b2;
②方程ax2+bx+c=0的两个根是x1=﹣1,x2=3;
③3a+c>0
④当y>0时,x的取值范围是﹣1≤x<3,其中结论正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845231205990400/2846335424397312/STEM/652158f58280421e9cabf6f604ad7b79.png?resizew=139)
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