二次函数
图象如图,下列结论:①
;②
;③当
时,
;④
;⑤若
,且
,则
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2019/10/25/2319596541558784/2320123424956416/STEM/298d8e216dfb4ed4a1dafeb569c73ee4.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060e7930731eddbcfac592b808e9b698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c024a97cff31cb54b6026300808798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deee559d44a0d1c1016b2053539f2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://img.xkw.com/dksih/QBM/2019/10/25/2319596541558784/2320123424956416/STEM/298d8e216dfb4ed4a1dafeb569c73ee4.png?resizew=150)
A.2个 | B.3个 | C.4个 | D.5个 |
19-20九年级上·湖北黄石·阶段练习 查看更多[5]
湖北省黄石市部分区2019-2020学年九年级上学期10月联考数学试题湖北省黄石市2019-2020学年第一学期九年级数学10月初中学业水平模拟试题重庆市重点中学(江津第二中学校、支坪中学等)九校2019-2020学年九年级上学期第二阶段月考数学试题(已下线)广州卷06-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广东广州专用)安徽省滁州市定远县第一初级中学2020-2021学年九年级上学期第二次月考数学试题
更新时间:2019-10-26 09:26:06
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【推荐1】已知抛物线
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【推荐2】已知抛物线y=ax2+bx+c(a≠0)在平面直角坐标系中的位置如图所示,则下列结论中,正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/1/1/1851156295090176/1853946830282752/STEM/6eb6ffd9e09147eebc91e04d415b1f55.png?resizew=136)
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【推荐1】如图,二次函数
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;④
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【推荐2】已知二次函数
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①
;
②
;
③
;
④
.
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88648177185088c9e391db77f21a5707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b3c94d505e7c5bcce94afec4af3d92.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae28deb43063b00c3200496fbb2da2d5.png)
③
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④
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其中正确结论的个数是( )
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【推荐1】如图,二次函数
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【推荐2】二次函数y=ax2+bx+c(a≠0)的大致图象如图所示,顶点坐标为(﹣2,﹣9a),下列结论:①a﹣3b+2c>0;②3a﹣2b﹣c=0;③若方程a(x+5)(x﹣1)=﹣1有两个根x1和x2,且x1<x2,则﹣5<x1<x2<1;④若方程|ax2+bx+c|=1有四个根,则这四个根的和为﹣8.其中正确的结论有( )
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