如图,抛物线
与x轴交于点
和点
,以下结论:①
;②
;③
;④当
时,y随x的增大而减小.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1beec07792cbfc2f46de2aa151c5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e482dd69ac1cf7f06552fdf25a217c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/7cd5f9f1-033c-4f43-b8e7-242b235e078b.png?resizew=139)
A.1 | B.2 | C.3 | D.4 |
更新时间:2023-10-10 18:56:34
|
相似题推荐
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【推荐1】关于x的二次函数
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bb4931fa3836bc2d705f3e013f036c.png)
A.对任意实数k,函数与x轴都没有交点 |
B.存在实数n,满足当![]() |
C.不存在实数n,满足当![]() |
D.对任意实数k,抛物线![]() |
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【推荐2】如图是直线
(a,b,c是常数且
,
,
),则抛物线
和双曲线
在同一平面直角坐标系中的图象可能为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba87a223b90ee387759c7ca16fdecdb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03b011f69dfc5262a3d82f64676739b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef20073a12bab727faa217718b63414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0706512405eae87315eeb330061a06.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】如图,二次函数y=ax2+bx+c(a≠0)图象的对称轴为直线x=﹣1,下列结论:①abc<0;②3a<﹣c;③若m为任意实数,则有a﹣bm≤am2+b; ④若图象经过点(﹣3,﹣2),方程ax2+bx+c+2=0的两根为x1,x2(|x1|<|x2|),则2x1﹣x2=5.其中正确的结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/ab4acc20-5ff9-4ce3-a83d-ce99ec04a663.png?resizew=214)
A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐2】抛物线
与x轴的一个交点为
,与y轴交于点C,点D是抛物线的顶点,对称轴为直线
,其部分图象如图所示,则以下4个结论:①
;②
,
是抛物线
上的两个点,若
,且
,则
;③在
轴上有一动点P,当
的值最小时,则点P的坐标为
;④若关于x的方程
无实数根,则b的取值范围是
.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1c84057882768f20a01365c81b6760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf99d32082c8bc6e62168c2ff38a6066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ed036dbb246db21d427b1841ed338c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62df6feec0736be43171e25089d12677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cd9af362cd03aca8cc82a6c8491492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6465da5933a512cea5014bb55c5ee855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49e7be7a373bd9ff32b6441c3d6b4ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e42953357fe79c16248ef4c79e6089.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】已知二次函数
的图象如图示,在下列四个结论中:①
;②
;③
;④
.错误的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6848d3dd360edae4663c4b86b5fb4245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630bb948780be53bc73d9ddef875000.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,函数
与
的图象如图所示,以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/bd3020a8-bdae-4abc-982a-3d7d2ee01ab2.png?resizew=129)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/bd3020a8-bdae-4abc-982a-3d7d2ee01ab2.png?resizew=129)
A.![]() | B.![]() |
C.![]() | D.当![]() ![]() |
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