如图,抛物线y=ax2+bx+c与x轴的一个交点A在点(﹣2,0)和(﹣1,0)之间(包括这两点),顶点C是矩形DEFG上(包括边界和内部)的一个动点,则:
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195285557248/1574195291152384/STEM/ec9df64c4619458d8c7f77a9ade8d1b9.png?resizew=198)
(1)abc_____ 0(填“>”或“<”);
(2)a的取值范围是________________ .
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195285557248/1574195291152384/STEM/ec9df64c4619458d8c7f77a9ade8d1b9.png?resizew=198)
(1)abc
(2)a的取值范围是
11-12九年级上·浙江杭州·阶段练习 查看更多[3]
更新时间:2016-12-06 12:11:25
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【推荐1】已知二次函数
的图象开口向上,对称轴为直线
,
为抛物线上的两点,下列结论中一定正确的是_____ .(填序号)
;②
;
(
是一个常数);④若
,则
.
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【推荐2】二次函数
(
,
,
是常数,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
的自变量
与函数值
的部分对应值如表:
且当
时,与其对应的函数值
,有下列结论:①
;②当
时,
随
的增大而减小;③关于
的方程
的两个根是
和
;④
.其中正确的结论是______ .(填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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【推荐1】若抛物线
的顶点为
,抛物线
的顶点为B,且满足顶点A在抛物线
上,顶点B在抛物线
上,则称抛物线
与抛物线
互为“关联抛物线”,已知顶点为M的抛物线
与顶点为N的抛物线互为“关联抛物线”,直线MN与
轴正半轴交于点D,如果
,那么顶点为N的抛物线的表达式为_________
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【推荐2】如图,抛物线
与x轴交于点A、B,把抛物线在x轴及其上方的部分记作
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若直线
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