对于二次函数
,有下列说法:①它的图象与
轴有两个公共点;②如果当
≤1时
随
的增大而减小,则
;③如果将它的图象向左平移3个单位后过原点,则
;④如果当
时的函数值与
时的函数值相等,则当
时的函数值为
.其中正确的说法是 .(把你认为正确说法的序号都填上)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/9e6d7d28650242edb07d1c33c1ef8194.png?resizew=100)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/299a213db6ec42e6b11f397cef2459b5.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/299a213db6ec42e6b11f397cef2459b5.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/632d9236907b4fdaad0235d2811320ca.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/299a213db6ec42e6b11f397cef2459b5.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/e9ff234a7214440882d08c3fd80ff019.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/970f9098d8ff40be8b35f7d9c80b278b.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/71157993bd7243739f5e99275e2c07ae.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/8faec6c0146743cd9f35f2b42df49076.png?resizew=56)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/50a6a6d3146845c4bc68e31d75281536.png?resizew=56)
![](https://img.xkw.com/dksih/QBM/2012/7/10/1573435265572864/1573435331297280/STEM/02d9f187ce25425fad94636df404c243.png?resizew=23)
2012·湖北咸宁·中考真题 查看更多[1]
(已下线)2012年初中毕业升学考试(湖北咸宁卷)数学
更新时间:2012-07-10 09:25:04
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【推荐1】二次函数
的部分对应值如下表:
当
时,对应的函数值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | … | -3 | -2 | 0 | 1 | 3 | 5 | … |
y | … | 7 | 1 | -8 | -9 | -5 | 7 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
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【推荐2】如图所示,抛物线y=ax2+bx+c的顶点为B(﹣1,3),与x轴的交点A在点(﹣3,0)和(﹣2,0)之间,以下结论:①b2﹣4ac=0 ②a+b+c>0 ③2a﹣b=0④c﹣a=3,其中正确的有_____ .(填序号)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394753039278080/2395493299355648/STEM/ef3c42ca387d4359b3f7c49d8623a615.png?resizew=137)
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【推荐1】如图,抛物线y=ax2+bx+c与轴交于点A(﹣1,0),B(3,0),交y轴的正半轴于点C,对称轴交抛物线于点D,交x轴与点E,则下列结论:①b+2c>0;②a(k2+1)2+b(k2+1)<a(k2+2)2+b(k2+2);③a+b>am2+bm(m为任意实数);④若m是方程ax2+bx+c=0的一个根,则一定有b2﹣4ac=(2am+b)2成立;⑤若点P为对称轴上的动点,则|PB﹣PC|有最大值,最大值为
,其中正确的结论有 _____ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174dbd66217e17ef22ed54f2f9fdd9bc.png)
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【推荐2】从﹣1,0,1,2,3这五个数中,随机抽取一个数记为m,则使关于x的不等式组
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13da3a7de48fd3ce60534a3d8a5311e9.png)
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