抛物线
上部分点的横坐标x和纵坐标y的对应值如下表,下列说法正确的有( ).
①当
时,y随x的增大而减小; ②抛物线的对称轴为直线
;
③当
时,
; ④方程
的一个正数解
满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | … | 0 | 1 | … | ||||
y | … | 3 | 3 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806c0ee9c41c0accc711dd325aefa26f.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/de1be6798f6f5497315b6a746acbfd34.png)
A.①② | B.①②③ | C.②③④ | D.①②④ |
更新时间:2024-04-26 11:54:42
|
相似题推荐
单选题
|
适中
(0.65)
【推荐1】二次函数y=x2+2mx+m2-1,在1≤x≤2时,y≥0.则m的取值范围是( )
A.m≥0或m≤-1 | B.m≥0或m≤-3 | C.m≥2或m≤-1 | D.m≥2或m≤-3 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】已知,点
,
,
在二次函数
图象上,则
,
,
的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6784f358cd22ed0eaaa07f65366a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f841cac0a38c696a5f199b81258ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5218ce970732feb65dfe7e85517575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad989122c7960ef08a7456df6003854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】二次函数
图象如图,下列结论:①
;②
;③当
时,
;④
;⑤若
,且
,则
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2019/10/25/2319596541558784/2320123424956416/STEM/298d8e216dfb4ed4a1dafeb569c73ee4.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.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/060e7930731eddbcfac592b808e9b698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c024a97cff31cb54b6026300808798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deee559d44a0d1c1016b2053539f2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://img.xkw.com/dksih/QBM/2019/10/25/2319596541558784/2320123424956416/STEM/298d8e216dfb4ed4a1dafeb569c73ee4.png?resizew=150)
A.2个 | B.3个 | C.4个 | D.5个 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图所示,抛物线y=ax²+bx+c(a≠0)的对称轴为直线x=1,与y轴的一个交点坐标为(0,3),其部分图像如图所示,下列5个结论中,其中正确的是( )
①abc>0;②4a+c>0;③方程ax²+bx+c=3两个根是
=0,
=2;④方程ax²+bx+c=0有一个实数根大于2;⑤当x<0,y随x增大而增大
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/7a753e20-4f85-42b4-8c88-553777438eca.png?resizew=148)
①abc>0;②4a+c>0;③方程ax²+bx+c=3两个根是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/7a753e20-4f85-42b4-8c88-553777438eca.png?resizew=148)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次