当a<0时,
的开口方向 _______ 顶点坐标_________ 对称轴_________ 在对称轴左侧,即当x<
时,y随x的增大而________ ;在对称轴右侧,即当x>
时,y随x的增大而_________ ,当x=
时,y有最大值y=________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b268d9d6d4cc23f3692bad62a81e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b268d9d6d4cc23f3692bad62a81e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b268d9d6d4cc23f3692bad62a81e8.png)
更新时间:2021-08-31 09:42:54
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【知识点】 y=ax²的图象和性质解读
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【推荐1】已知函数
,不画图像,回答下列各题.
(1)开口方向为______ ;
(2)对称轴为______ ;
(3)顶点坐标为______ ;
(4)当
时,
随
的增大而______ ;
(5)当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
______ 时,
;
(6)当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
______ 时,函数
的最______ 值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62684f2b32ad1f3f079c94113202fdd.png)
(1)开口方向为
(2)对称轴为
(3)顶点坐标为
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(5)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
(6)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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