二次函数
(a,b、c为常数,且
)的图象如图所示,其对称轴为直线
,则下列关系式错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/3e31a875-6932-41cc-b0a7-ee15ea9c2dc0.png?resizew=132)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-05-22 05:58:54
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【推荐1】已知二次函数
的图象如图所示,对称轴为直线
,与
轴正半轴交点的横坐标为3,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8fb59926-a5f8-4cf6-987a-65576f85bb26.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7152aea5d046953a8c931571be7c529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8fb59926-a5f8-4cf6-987a-65576f85bb26.png?resizew=176)
A.![]() | B.关于![]() ![]() ![]() ![]() |
C.当![]() ![]() ![]() | D.![]() |
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【推荐2】已知二次函数
的图象过点
,
,
,
.点
,
也在该函数的图象上,当
,
时,
与
的大小关系正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aade88bf95f61cb9789fe9b460413eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaacaeef0e411c662a1d268e4721413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d1473118243db0fc6a01747dd6ae39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0cb294cd75c681db3420973c77ad35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec981aa682111c285df87f4a9ee218a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dac296a35f8c6c933f091adbbfb6a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4399446f710b1d637790bc6ff66e3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec6e8a2450586ef1cc34acfc19b1312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa47530765800745c4f394c05720b06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d64076c12ccdd9ccf443dca26770e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75c7fce5824a66b94975608335a9311.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,抛物线
与x轴交于点
,顶点坐标
与y轴交在
,
之间(包含端点),则下列结论:①
;②
;③对于任意实数m,
总成立;④关于x的方程
有两个不等的实根. 其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/4/12/2440095703736320/2440575457435648/STEM/c8a2159505f040229e9b395815dd6c60.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6ad85072c47fbb57fb296d4096322c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727b2f9ed96487c6d08bc26e647f76d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbf89dee49b920ae4cf0c2c6285d2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8f1b58ebcb6caea25fea71bfbccd1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5d55b3906494569b9aef9e5afc059f.png)
![](https://img.xkw.com/dksih/QBM/2020/4/12/2440095703736320/2440575457435648/STEM/c8a2159505f040229e9b395815dd6c60.png?resizew=149)
A.1个 | B.2个 | C.3个 | D.4个 |
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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:①a>0;②b>0; ③方程ax2+bx+c=0的两个根是x1=﹣1,x2=3;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/2021/3/1/2668313406464000/2671322063667200/STEM/36abc90fbc0847968c85313a6cb5938a.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2021/3/1/2668313406464000/2671322063667200/STEM/36abc90fbc0847968c85313a6cb5938a.png?resizew=135)
A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐1】二次函数
的部分图像如图所示,图像过点
对称轴为直线
,下列结论:①
;②
;③
(
为常数):④
.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d1b0e316f658f4ffe056511101614d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def368464825089ea5bb86c563faffe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0e23ff139755c47b7688ba864caae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19e44c4edf80de1996caef1724d0488.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】抛物线
的部分图象如图所示,与
轴的一个交点坐标为
,抛物线的对称轴是直线
.下列结论中:①
;②
;③
;④若点
在该抛物线上,则
,其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577922740838400/2578701642276864/STEM/22854276-92ad-4cda-8c7f-3a0dcbba11c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.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/9d2fcd04d62f953f6949f97b1e4fbbe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66c5f00b5b38a2d052354b5611970e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe9eedf4346c102cdfcd993eb7fcd34.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577922740838400/2578701642276864/STEM/22854276-92ad-4cda-8c7f-3a0dcbba11c9.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】若抛物线
与x轴的一个交点坐标为
,则a的值在下列取值范围内的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7bb7af95df3b791f886fbb58fd402b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】对于二次函数y=ax2﹣2ax﹣3a+3的性质,下列说法中错误的是( )
A.抛物线的对称轴为直线x=1 |
B.抛物线一定经过两定点(﹣1,3)与(3,3) |
C.当a<0时,抛物线与x轴一定有两个不同的交点 |
D.当a>0时,抛物线与x轴一定有两个不同的交点 |
您最近一年使用:0次