如图,已知抛物线
与直线
交于
和
两点,现有以下结论:①
;②
;③
;④当
时,
;⑤当
时,
,其中正确的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/6b6bc601-60a1-4503-b382-7e12bfae8fc9.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12f5329716234ea36d40f9058f8270a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5796f99bdb2e17f5939da3cc5e5ea19c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e184a9fd17a68b10b662aa68c76993ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0345ad2eb83035986f0ad4d3abaa44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637cdfcaa4a5f59d7a75bd86a5d4f906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9281bc41d404b0d01dade7e1ec578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/6b6bc601-60a1-4503-b382-7e12bfae8fc9.png?resizew=139)
A.①②⑤ | B.①③④ | C.③④⑤ | D.②③⑤ |
更新时间:2023-01-06 11:00:28
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【推荐1】对于二次函数y=ax2-(2a-1)x+a-1(a≠0),有下列结论:①其图象与x轴一定相交;②若a<0,函数在x>1时,y随x的增大而减小;③无论a取何值,抛物线的顶点始终在同一条直线上;④无论a取何值,函数图象都经过同一个点.其中正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图,已知抛物线
与
轴交于
,
两点,与
轴交于点
,对称轴为直线
.直线
与抛物线交于
,
两点,
点在
轴下方且横坐标小于3,则下列结论错误的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/5/2634413663739904/2679681433305088/STEM/33c7c1a7508a443c9d8f2911d035b319.png?resizew=140)
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A.![]() | B.![]() |
C.![]() | D.当![]() ![]() |
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【推荐1】如图,在二次函数的图象中,小明同学观察得出了下面几条信息:①
;②
;③
;④
;⑤关于
的一元二次方程
无实数根,其中信息正确的个数为( ).
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A.4 | B.3 | C.2 | D.1 |
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【推荐2】如图,根据二次函数y=ax2+bx+c(a≠0)的图象,有下列几种说法:
①a+b+c>0;
②该抛物线的对称轴是直线x=﹣1;
③当x=1时,y=2a;
④am2+bm+a>0(m≠﹣1).
其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2018/5/15/1945751569842176/1947303770677248/STEM/7507779d4c574bc6ae536306f046caab.png?resizew=109)
①a+b+c>0;
②该抛物线的对称轴是直线x=﹣1;
③当x=1时,y=2a;
④am2+bm+a>0(m≠﹣1).
其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2018/5/15/1945751569842176/1947303770677248/STEM/7507779d4c574bc6ae536306f046caab.png?resizew=109)
A.1个 | B.2个 | C.3个 | D.4个 |
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名校
【推荐1】在同一平面直角坐标系中,一次函数
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】若
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【推荐1】函数y=ax2﹣a与y=﹣
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