二次函数
的图象如图所示,给出下列结论:①
;②
;③若
,则
;④
,其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1cebb6878f178099c3ccba6761586b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96be88a97e450e79fd5bf2a15b79ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd92efffc6a8aa1a9d39a8c401b3e6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/9de1d49b-e6d2-4f07-aaa3-99b7f65b0ee8.png?resizew=159)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2023-10-14 22:41:04
|
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真题
【推荐1】如图,抛物线y=ax2+bx+c(a≠0)与x轴交于点A(5,0),与y轴交于点C,其对称轴为直线x=2,结合图象分析如下结论:①abc>0;②b+3a<0;③当x>0时,y随x的增大而增大;④若一次函数y=kx+b(k≠0)的图象经过点A,则点E(k,b)在第四象限;⑤点M是抛物线的顶点,若CM⊥AM,则a=
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1145c162038df3c7184d9201c628e.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,点
是抛物线
上第一象限内一动点,
,
,过点
分别作
轴、
轴的平行线,分别交直线
于
,
两点,过点
作
的垂线,垂足为
.下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/760f88b6-1a71-4c2b-a127-ef6dd55bf935.png?resizew=436)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/760f88b6-1a71-4c2b-a127-ef6dd55bf935.png?resizew=436)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() ![]() |
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名校
【推荐1】如图,是二次函数
的图象的一部分,给出下列命题:①
;②
;③
的两根分别为
、
(
),则
,
;④
.其中正确的命题是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/ef13758e-5f02-40ae-827d-1e4f7adcb0d8.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3670c603c5bc8f8b0d0858170c269ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65cc9c2b83f2e321ef86e353340ce8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60994f80d3ced53fc18ddd7e3d659aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4236b6131fab1849437a594a811a9f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/ef13758e-5f02-40ae-827d-1e4f7adcb0d8.png?resizew=169)
A.①③ | B.②③ | C.①② | D.①②③④ |
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【推荐2】二次函数y=ax2+bx+c(a,b,c是常数,a≠0)的自变量x与函数值y的部分对应值如表:
且当x
时,与其对应的函数值y<0,有以下结论:①abc<0;②﹣2和3是关于x的方程ax2+bx+c=t的两个根;③a
;④m+n
.其中正确结论的个数是( )
x | … | ﹣2 | ﹣1 | 0 | 1 | 2 | … |
y=ax2+bx+c | … | t | m | 2 | 2 | n | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a162dc68b1f6889351e5727b6d2d014e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81cfde1dcb4119a44cdac4635d88a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf929b0ef63a15ebd24196f83581b81f.png)
A.1 | B.2 | C.3 | D.4 |
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名校
【推荐1】二次函数
的图象如图所示.对称轴是直线
,有以下结论;①
;②
;③
;④若抛物线上三点坐标为
,
,
,则
;⑤
,其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2022/4/26/2970849260912640/2987860044193792/STEM/e3cced65c71645a38654a6c212bad5f5.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07f84c7a3d889902f2a20d512b50516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad08520db546be2e4b842e7508c374b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc402dcbec7d4f3df72e8d3e9a6c06ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ce845097b47f856d3aa26c35175c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aeb3a51cbed6d81509399abea6217da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f1fa86e984f7cee0b875b17531052b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbab7bf187ffceed0d2bbc9796bdc1d.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2970849260912640/2987860044193792/STEM/e3cced65c71645a38654a6c212bad5f5.png?resizew=193)
A.①②③ | B.②③④ | C.①③⑤ | D.②③⑤ |
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【推荐2】二次函数
图象如图,下列正确的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
①
;②
;③
;④
有两个解
,
,当
时,
,
;⑤
;⑥当
时,
随
增大而减小.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481680103112704/2484326612623360/STEM/7d0fe1e6d4da49c9ae284ff2ef8497c0.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e489645a4930d59e21720c0c44ac318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d0d6e6a209c645b1550c1fecf63b20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2210f152080d9a68a97c805f5c1cde96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6270bb08b90f72d5671ab8225f356c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e8b230513c1934f2c29bb19b54d4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481680103112704/2484326612623360/STEM/7d0fe1e6d4da49c9ae284ff2ef8497c0.png?resizew=114)
A.2 | B.3 | C.4 | D.5 |
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【推荐1】二次函数
分别交x轴、y轴于P,Q两点,点C的坐标是(2,1).若在线段
上存在A,B两点使得
为等腰直角三角形,且
,则b的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f497e3b58c18378b73d36bcd1ef32ad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
A.![]() ![]() | B.![]() ![]() | C.![]() | D.![]() |
您最近一年使用:0次