在平面直角坐标系中,抛物线
的图象如图所示,对任意的
,称
为
到
时
的值的“极差”(即
时
的最大值与最小值的差),
为
到
时
的值的“极宽”(即
与
的差值),则当
时,
的取值范围是 ____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a0f771a5202ab87fa0320d75694c28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57fade0e1efadfe94869f6b91505dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261dc73e41f3dff630bbfff7d514e489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba32c8f2ef4b537ac7ac33bc2d1f9c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://img.xkw.com/dksih/QBM/2023/8/13/3301858034376704/3416764981993472/STEM/639d0f5b2cc448a4835d1628716f1fe8.png?resizew=183)
更新时间:2024-02-02 10:30:13
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【推荐1】下列关于二次函数
(a,m为常数,
)的结论:
①当
时,其图象与x轴无交点;
②其图象上有两点
,
其中
,
,
;
③无论m取何值时,其图象的顶点在一条确定的直线上;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc3eb2b0592ef2352237c35fdb50cd7.png)
②其图象上有两点
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ac8f3b53dde42307d38cca9b7bd98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
③无论m取何值时,其图象的顶点在一条确定的直线上;
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01039a15444e00eb348bcca174434423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf9befc3b336d83b83bcfcbc19c0752.png)
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【推荐2】二次函数
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②
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6263af3f6cf1e9a4aaab0a097306006f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5960d3e0d7e4d05783ff925f9a75318.png)
③方
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29418e5014731850c55565b6bf47aa41.png)
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④方程
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
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【推荐2】如图,在
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