如图,二次函数
的图象经过点
,且与
轴交点的横坐标分别为
、
,其中
,
,下列结论:
;
;
;
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/b1e68054-2d08-4fd8-ac8a-f3b48980234c.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c7b74fd862d7e3f35e40ae1f626c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/a79303098aa255f4bf321752a5ad9bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d01c545537e6330e36a618706d7b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf3ebeb45fae0496b31e7a6714ab9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b959ec71996db19a38618f7f05bc643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08326b06d88b400e4f9899089ea67d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef122db736d86d78e37ff28c5a57aa6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/b1e68054-2d08-4fd8-ac8a-f3b48980234c.png?resizew=145)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-10-03 18:54:22
|
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【推荐1】已知二次函数
的图象上有两点
和
(其中
),则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c162512433faf81018c88ec8d2b2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐2】已知抛物线
上某些点的横坐标
与纵坐标
的对应值如下表:
有以下几个结论:
①抛物线
与
轴的交点坐标是
;
②抛物线
的对称轴为直线
;
③关于x的方程
的根为
和
;
④当
时,
的取值范围是
.
其中正确的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | … | ![]() | ![]() | ![]() | ![]() | 0 | … |
![]() | … | ![]() | p | 1 | p | m | … |
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
②抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
③关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57458464618fcf619375a93d3c66d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eee6609d251811f253e26cf7815a54a.png)
其中正确的个数有( )
A.1 | B.2 | C.3 | D.4 |
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【推荐1】二次函数
部分图象如图所示,图象过点
,对称轴为直线
,下列结论:①
,②
,③
(
为任意实数),④若方程
两根为
,
且
,则
,⑤若点
在抛物线上,当二次函数的自变量
的取值范围为
时,则二次函数的函数值
的取值范围为
.其中正确的结论有( )个.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897298356060160/2898529702936576/STEM/b1543e43abeb487494995af9da1e32aa.png?resizew=229)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd8cd1b5b98af804ee71c2df8f1341b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bf8a7ad0b2714d0dc5ab7b3c5ab330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e6d08b4bf29459cf08912b55fa1f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99128759f1b0da106a4c9f008b9ba7aa.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/b6ea0d770d866fc878cdaf84f31d0d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b431187c37d6d5edfbdb458668fb9d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a417f68c6538bfb63e729c047755b4ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e73cc101a50d6d96e83a48434514c2.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897298356060160/2898529702936576/STEM/b1543e43abeb487494995af9da1e32aa.png?resizew=229)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,抛物线
与x轴正半轴交于A,B两点,若点A坐标为(1,0),点B坐标为(5,0),则下列结论中,正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/84187fd0-f8cb-4ab9-8d6a-582f02260bb8.png?resizew=202)
①
;②
;③
;④当
时,
;⑤对于任意的实数m,均有
;⑥若
,则关于x的方程
一定有4个实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/84187fd0-f8cb-4ab9-8d6a-582f02260bb8.png?resizew=202)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2a7f6730b99629ffeb92857ded1ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53168695826b0a33a23067b76173c7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30b350ddd88a61cf18c4e2143d66c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca060428dceb3a4d32cee50c9b1269f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4c78214e43a8b93f2a57072033cbcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e8176d84a7e86978873b5af0df860.png)
A.②③⑤ | B.②③⑤⑥ | C.①④⑥ | D.②③⑥ |
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【推荐1】抛物线y=ax2+bx+c对称轴为x=1,与x轴的负半轴的交点坐标是(x1,0),且-1<x1<0,它的部分图象如图所示,有下列结论:①abc<0;②b2-4ac>0;③9a+3b+c<0;④3a+c<0,其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2021/1/11/2633824576708608/2638662178455552/STEM/5fd8c5c5-2832-4d06-a4ad-acaf43ce93fa.png)
![](https://img.xkw.com/dksih/QBM/2021/1/11/2633824576708608/2638662178455552/STEM/5fd8c5c5-2832-4d06-a4ad-acaf43ce93fa.png)
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=﹣x2+2x+m+1交x轴于点A(a,0)和点B(b,0),交y轴于点C,抛物线的顶点为D.下列四个判断:
①当x>0时,y>0;
②若a=﹣1,则b=4;
③抛物线上有两点P(x1,y1)和Q(x2,y2),若x1<1<x2,且x1+x2>2,则y1>y2;
④若AB>2,则m<﹣1.
其中正确判断的序号是( )
![](https://img.xkw.com/dksih/QBM/2018/4/4/1917024923328512/1918479200436224/STEM/5cbda9bcd1fb4137ac17572d9f48517c.png?resizew=128)
①当x>0时,y>0;
②若a=﹣1,则b=4;
③抛物线上有两点P(x1,y1)和Q(x2,y2),若x1<1<x2,且x1+x2>2,则y1>y2;
④若AB>2,则m<﹣1.
其中正确判断的序号是( )
![](https://img.xkw.com/dksih/QBM/2018/4/4/1917024923328512/1918479200436224/STEM/5cbda9bcd1fb4137ac17572d9f48517c.png?resizew=128)
A.① | B.② | C.③ | D.④ |
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【推荐1】嘉琪同学在研究二次函数
(
为常数)的性质时得到以下结论:
①这个函数图像的顶点始终在直线
上;
②当
时,
随
的增大而减小,则
的取值范围为
;
③点
与点
在函数图像上,若
,则
;
④存在一个
的值,使得函数图像与
轴的两个交点和函数图像的顶点构成等腰直角三角形.
其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99e733f90bf53ed592efa1f921afd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
①这个函数图像的顶点始终在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec89d17a1b8f7961e2f1f27c2d50685.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13de3c1d3dc67a7fbb39b0ff14142310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bab696fa1b71f23ca1bf88d44fa9df9.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1da42ae0ec960d87e4af57aae06b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
④存在一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
其中正确的结论有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】已知二次函数y=(m﹣2)x2+2mx+m﹣3(
是常数)的图象与x轴有两个交点(x1,0),(x2,0),
,则下列说法:①该二次函数的图象一定过定点(﹣1,﹣5);②若该函数图象开口向下,则m的取值范围为:
;③若m=3,当
≤x≤0时,y的最大值为0,最小值为﹣9,则t的取值范围为
.其中,正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e97c26fd35c87418e4523cdb9013fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce863c16d8f765893bf13df163ad6e42.png)
A.0个 | B.1个 | C.2个 | D.3个 |
您最近一年使用:0次