已知二次函数
.
(1)在直角坐标系中描点,并画出该函数图像;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/394b957e-5db0-4038-bdd2-fd11f890321f.png?resizew=264)
(2)根据图像回答:当函数值
时,求x的取值范围?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
(1)在直角坐标系中描点,并画出该函数图像;
x | … | ___________ | ___________ | ___________ | __________ | ___________ | … |
y | … | ___________ | ___________ | ___________ | ___________ | ___________ | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/394b957e-5db0-4038-bdd2-fd11f890321f.png?resizew=264)
(2)根据图像回答:当函数值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b0a2c46148393f1d7104d75e03522bf.png)
更新时间:2022-11-14 15:44:05
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【推荐1】已知抛物线y=ax2+b x+c经过A(0,2),B(4,0),C(5,-3)三点,当x≥0时,其图象如图所示.
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【推荐2】已知二次函数y=x2+2x+a﹣2的图象和x轴有两个交点.
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【推荐1】自主学习,请阅读下列解题过程.
例:用图象法解一元二次不等式:
.
解:设
,则
是
的二次函数.
抛物线开口向上.
又
当
时,
,解得
.
由此得抛物线
的大致图象如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/6fb8b246-67f4-4403-9acc-b63a542cbda5.png?resizew=216)
观察函数图象可知:当
或
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
的解集是:
或
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通过对上述解题过程的学习,按其解题的思路和方法解答下列问题:
(1)上述解题过程中,渗透了下列数学思想中的 和 .(只填序号)①转化思想,②分类讨论思想,③数形结合思想
(2)观察图象,直接写出一元二次不等式:
的解集是 ;
(3)仿照上例,用图象法解一元二次不等式:
.
例:用图象法解一元二次不等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b051e1329de07b78b173b7980ea8ea.png)
解:设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
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【推荐2】已知二次函数
.
(1)补全表格,在平面直角坐标系中用描点法画出该二次函数的图象;
(2)根据图象回答:当0≤ x <3时,y的取值范围是______________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
(1)补全表格,在平面直角坐标系中用描点法画出该二次函数的图象;
x | … | 0 | 1 | 2 | 3 | 4 | … |
y | … | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/fa26e873-3e03-44d3-b817-641a2baac1ca.png?resizew=262)
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