下列关于二次函数
(k为常数)的结论:
①该函数的图象与x轴总有两个公共点;
②无论k为何值,该函数的图象必经过一个定点;
③若
,
为此抛物线图象上两点,当
时,
;
④该函数图象的顶点一定不在直线
的下方.
其中正确的结论是______ .(填写正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a62cbbf3912b2ff6576f550e63c112c.png)
①该函数的图象与x轴总有两个公共点;
②无论k为何值,该函数的图象必经过一个定点;
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30e643c2107f133c9c0f0a094a11840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2918540f1bcf504f278d5dcb5f3e5d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bbc89b61fb5fbd30449c4f35d571f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828e34c87049f73fe5aa04d32a4d96c7.png)
④该函数图象的顶点一定不在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672a83087961416762cf5d18a272ee96.png)
其中正确的结论是
更新时间:2022-10-10 10:02:40
|
相似题推荐
填空题
|
较难
(0.4)
真题
名校
【推荐1】二次函数y=ax2+bx+c的图象如图所示,给出下列结论:①2a+b>0;②b>a>c;③若﹣1<m<n<1,则m+n<
;④3|a|+|c|<2|b|.其中正确的结论是___ (写出你认为正确的所有结论序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4959731b39859941d702e680b554b707.png)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐2】如图,抛物线
与x轴交于点A、B,与y轴交于点C,过C作CD∥x轴,与抛物线交于点D.若OA=1,CD=4,则线段AB的长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://img.xkw.com/dksih/QBM/2017/9/27/1783002127622144/1784701766787072/STEM/c756d140216846208fab035fa4dfa472.png?resizew=132)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐1】已知抛物线
(
是常数),过顶点
两点,且
下列四个结论:①
;
②
;
③若点
在抛物线上,
,且
,则
;
④当图象经过点
时,方程
的两根为
,
,则
.正确的是______________ (填写序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ab5ac72b16ec0e62cd1b7aba581c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4581917005539a0806619080496676e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc661af044699d2dd03d74ca6170a71.png)
③若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4906b01cfc27a932a41fcac66b9851f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab1505308e2cf1c1ccc56df04e957e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
④当图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e88ebfb5c0d6cce558b515be06404d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96900bad6bfca4efce6f297c5b6a33d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd888afdcfdb3e91a157d50f65e915e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fd8fd8c4f19276cb9561371645fa0f.png)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐2】如图,抛物线y=ax2+bx+c的顶点为D,与x轴交点A,B的横坐标分别为﹣1,3,与y轴负半轴交于点C.下面五个结论:
①2a+b=0;
②4a+2b+c>0;
③对任意实数x,ax2+bx≥a+b;
④只有当a=
时,△ABD是等腰直角三角形;
⑤使△ABC为等腰三角形的a值可以有3个.
其中正确的结论有_____ .(填序号)
①2a+b=0;
②4a+2b+c>0;
③对任意实数x,ax2+bx≥a+b;
④只有当a=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
⑤使△ABC为等腰三角形的a值可以有3个.
其中正确的结论有
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/1c433390-c796-45bc-a7fd-48fb45eefdf8.png?resizew=205)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐1】已知抛物线
(a,b,c是常数,
)经过点
和
,且
,下列结论:①
;②
;③
;④若方程
有两个不相等的实数根,则
.其中正确的是___________ .(填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492a08866e2259e107cb15ce0200e04e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c682ff65e09299689387d967cd6d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276de9bbae3ff28be245b62e907e185b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e335abc03b8479b68c889214a38b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b59b69ef4af6a64424f068e4fa78556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5a58b0bdbff86e726581d5e903bff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd82e07fc3e268ef16599eb2ee6ac5d9.png)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐2】如图,抛物线
的顶点为D,与x轴交点A,B的横坐标分别为
,3,与y轴负半轴交于点C.下面五个结论:①
;②
;③对任意实数x,
;④
,
是抛物线上两点
,若
,则
;⑤使
为等腰三角形的a值可以有3个.其中正确的结论有__________ (填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37efb179686525e1a0aec162008f605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1efe9a513e7271ea652b9dcaa4338529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9dfa68c2351b49b64e10d256b3a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793894c733026e3f5900b31538fcb731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2dff006a89ed43e44492206e8516e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af029e933ded38d74c2a9d283e3b92d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ca13a93b5f401c0d39ba52b0cffcb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次