在初中阶段的函数学习中,我们经历了列表、描点、连线画函数图象,并结合图象研究函数性质的过程.以下是我们研究函数
性质及其应用的部分过程,请按要求完成下列各小题.
(1)填空:b= ,c= ;并在图中补全该函数图象;
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797764889681920/2798032670720000/STEM/51e56eb9ddb8404e84e4748bdfc365de.png?resizew=325)
(2)根据函数图象,判断下列关于该函数性质的说法是否正确,正确的写“对”,错误的写“错”;
①该函数图象是轴对称图形,它的对称轴为y轴. ;
②该函数有最大值和最小值.当x=1时,函数取得最小值﹣3;当x=﹣1时,函数取得最大值3. ;
③当x<﹣1或x>1时,y随x的增大而增大;当﹣1<x<1时,y随x的增大而减小. ;
(3)已知函数y=﹣2x﹣1的图象如图所示,结合你所画的函数图象,直接写出不等式
>﹣2x﹣1的解集(保留1位小数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fcc6f8852aaa756d0944d750df6035b.png)
(1)填空:b= ,c= ;并在图中补全该函数图象;
x | … | ﹣5 | ﹣4 | ﹣3 | ﹣2 | ﹣1 | 0 | 1 | 2 | 3 | 4 | 5 | … |
![]() | … | ![]() | ![]() | b | ![]() | 3 | 0 | ﹣3 | ![]() | c | ![]() | ![]() | … |
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797764889681920/2798032670720000/STEM/51e56eb9ddb8404e84e4748bdfc365de.png?resizew=325)
(2)根据函数图象,判断下列关于该函数性质的说法是否正确,正确的写“对”,错误的写“错”;
①该函数图象是轴对称图形,它的对称轴为y轴. ;
②该函数有最大值和最小值.当x=1时,函数取得最小值﹣3;当x=﹣1时,函数取得最大值3. ;
③当x<﹣1或x>1时,y随x的增大而增大;当﹣1<x<1时,y随x的增大而减小. ;
(3)已知函数y=﹣2x﹣1的图象如图所示,结合你所画的函数图象,直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0be6ac6980f8803403520079250efc0.png)
更新时间:2021-08-31 14:34:57
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解答题-作图题
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【推荐1】如图,点E在弦AB所对的优弧上,且弧BE为半圆,C是弧BE上的动点,连接CA,CB.已知AB=4cm,设B,C两点间的距离为xcm,点C到弦AB所在直线的距离为y1cm,A,C两点间的距离为y2cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/e5ae1625-cfde-4404-8160-26095ae7b15c.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/65b0f1c5-4f1a-4962-a887-0f5e951a65c7.png?resizew=385)
小明根据学习函数的经验,分别对函数y1,y2随自变量x的变化而变化的规律进行了探究.
下面是小明的探究过程,请补充完整:
(1)按照表中自变量x的值进行取点、画图、测量,分别得到了y1,y2与x的几组对应值;
上表中a的值为 .
(2)在同一平面直角坐标系xOy中,描出补全后的表中各组数值所对应的点(x,y1),(x.y2),并画出函数y1的图象如图所示.请在同一坐标系中画出函数y2的图象;
(3)结合函数图象,解决问题:
①连接BE,则BE的长约为 cm;
②当以A,B,C为顶点组成的三角形是直角三角形时,BC的长度约为 cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/e5ae1625-cfde-4404-8160-26095ae7b15c.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/65b0f1c5-4f1a-4962-a887-0f5e951a65c7.png?resizew=385)
小明根据学习函数的经验,分别对函数y1,y2随自变量x的变化而变化的规律进行了探究.
下面是小明的探究过程,请补充完整:
(1)按照表中自变量x的值进行取点、画图、测量,分别得到了y1,y2与x的几组对应值;
x/cm | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
y1/cm | 0 | 0.78 | 1.76 | 2.85 | 3.98 | 4.95 | 4.47 |
y2/cm | 4 | 4.69 | 5.26 | a | 5.96 | 5.94 | 4.47 |
(2)在同一平面直角坐标系xOy中,描出补全后的表中各组数值所对应的点(x,y1),(x.y2),并画出函数y1的图象如图所示.请在同一坐标系中画出函数y2的图象;
(3)结合函数图象,解决问题:
①连接BE,则BE的长约为 cm;
②当以A,B,C为顶点组成的三角形是直角三角形时,BC的长度约为 cm.
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【推荐2】甲、乙两车从佳木斯出发前往哈尔滨,甲车先出发,1
以后乙车出发,在整个过程中,两车离开佳木斯的距离y(
)与乙车行驶时间x(
)的对应关系如图所示∶
(1)直接写出佳木斯、哈尔滨两城之间距离是多少
;
(2)求乙车出发多长时间追上甲车;
(3)直接写出甲车在行驶过程中经过多长时间,与乙车相距18
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933311c0c090e1138e4dd388b7adf8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933311c0c090e1138e4dd388b7adf8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/5d700b6c-e662-4ca2-b8b5-57b2e21b5588.png?resizew=250)
(1)直接写出佳木斯、哈尔滨两城之间距离是多少
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
(2)求乙车出发多长时间追上甲车;
(3)直接写出甲车在行驶过程中经过多长时间,与乙车相距18
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
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【推荐1】描点画图是探究未知函数图象变化规律的一个重要方法,下面是通过描点画图感知函数
图象的变化规律的过程:
请根据学习函数的经验,利用上述表格所反映的
与
之间的变化规律,对该函数的图象与性质进行探究.
(1)函数
的自变量
的取值范围是
(2)表中是
与
的对应值,则
(3)如图,在平面直角坐标系中,描出了以上表中各对对应值为坐标的点,请你先描出点
,然后画出该函数的图象;
(4)若关于
的不等式
的解集是
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1fe7b93dfcd114bdc96fc69b44f409.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | …… |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | …… |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1fe7b93dfcd114bdc96fc69b44f409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)表中是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(3)如图,在平面直角坐标系中,描出了以上表中各对对应值为坐标的点,请你先描出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3402e3df815bf7859f308f33651d40d3.png)
(4)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c81d3eb8905381af98fc7fa292b9f9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95800ce519e139befd294359d8bfe30f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/783e6a5c-c6a6-42e2-bc08-dc6df1aef0ce.png?resizew=285)
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【推荐2】数学活动课上,小明同学根据学习函数的经验,对函数的图象、性质进行了探究.如图1,已知在
中,
,
,
,点P为AB边上的一个动点,连接PC,设
,
,
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895927304634368/2934571169914880/STEM/184fab3d-5b3c-4012-90b8-5cb1a686684a.png?resizew=317)
(1)当
时,则 x= ;y= ;
(2)填表:
(说明:补全表格时相关数值保留一位小数)(参考数据:
;
).
(3)试求y与x之间的函数关系式;
a、建立平面直角坐标系,如图2,描出剩余的点,并用光滑的曲线画出该函数的图象;
b、结合画出的函数图象,写出该函数的两条性质:
① ;
② .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f4bcb7ddcdbb66f0304d0531e84c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eee6f84b2af5e06da1cd3d0a1f3a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa03b06bc3ffc95899645c08b21fcd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a80b46e3ef7314b35df0517c969608.png)
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895927304634368/2934571169914880/STEM/184fab3d-5b3c-4012-90b8-5cb1a686684a.png?resizew=317)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2e118d8156830746055c1b2e759ab0.png)
(2)填表:
x/cm | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 |
y/cm | 2 | 1.8 | 1.7 | 2 | 2.3 | 2.6 | 3 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f0684b92d6d24d90a6fb39d3d6529d.png)
(3)试求y与x之间的函数关系式;
a、建立平面直角坐标系,如图2,描出剩余的点,并用光滑的曲线画出该函数的图象;
b、结合画出的函数图象,写出该函数的两条性质:
① ;
② .
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解题方法
【推荐3】如图,点
是以
为直径的半圆上一点,连接
,点
是
上一个动点,连接
,作
交
于点
,交半圆于点
.已知:
,设
的长度为
,
的长度为
,
的长度为
(当点
与点
重合时,
,
,当点
与点
重合时,
,
).
小锐同学根据学习函数的经验,分别对函数
,
随自变量
变化而变化的规律进行了探究.
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730821173362688/2741473869086720/STEM/d4607e07-1fec-4820-896b-5f017ad05b3d.png)
下面是小锐同学的探究过程,请补充完整:
(1)按照下表中自变量
的值进行取点、画图、测量,分别得到了
,
与
的几组对应值,请补全表格:
上表中
______.(精确到0.1)
(2)在同一平面直角坐标系
中,描出补全后的表中各组数值所对应的点
,
,并画出函数
,
的图象(
已经画出);
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730821173362688/2741473869086720/STEM/d6b4174a-5e74-4ee2-b043-2fc8ce74d52a.png)
(3)结合函数图象解决问题:
①当
,
的长都大于
时,
长度的取值范围约是______;(精确到0.1)
②继续在同一坐标系中画出所需的函数图象,判断点
,
,
能否在以
为圆心的同一个圆上?(填“能”或“否”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed36b04649a93edd15f9a4c49f366d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38703a1be638e22eb5d06e315fbff406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469490cb0402f8cf5a51a143dd9e124f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b51d353402416601ea1954e6a45a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f588f56270355ba69b0c6936f87c40cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15286e776ce9f090bb8df23e6e30a3bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f588f56270355ba69b0c6936f87c40cb.png)
小锐同学根据学习函数的经验,分别对函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730821173362688/2741473869086720/STEM/d4607e07-1fec-4820-896b-5f017ad05b3d.png)
下面是小锐同学的探究过程,请补充完整:
(1)按照下表中自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
![]() | 8.00 | 5.81 | 4.38 | 3.35 | 2.55 | 1.85 | 1.21 | 0.60 | 0.00 |
![]() | 0.00 | 0.90 | ![]() | 2.24 | 2.67 | 2.89 | 2.83 | 2.34 | 0.00 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
(2)在同一平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8529f413a378df2659f52e946e9a4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc46bbcc5bfcfc6ce73f3bac905f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730821173362688/2741473869086720/STEM/d6b4174a-5e74-4ee2-b043-2fc8ce74d52a.png)
(3)结合函数图象解决问题:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
②继续在同一坐标系中画出所需的函数图象,判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-问答题
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较难
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【推荐1】如图,一次函数
的图象交x轴于点A,
,与正比例函数
的图象交于点B,B点的横坐标为1.
的解析式;
(2)请直接写出
时自变量x的取值范围;
(3)若点P在y轴上,且满足
的面积是
面积的一半,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a9b769d70cb6f29e965c800921c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
(2)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46336fd383466e0855937fda0dafee18.png)
(3)若点P在y轴上,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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【推荐2】[问题提出]∶ 如何解不等式
?
预备知识1:
同学们学习了一元一次方程、一元一次不等式和一次函数,利用这些一次模型和函数的图象,可以解决一系列问题.
图①中给出了函数
和
的图象,观察图象,我们可以得到:
当
时, 函数
的图象在
图象上方, 由此可知∶ 不等式
的解集为 .
预备知识2:函数
称为分段函数,其图象如图②所示,实际上对带有绝对值的代数式的化简,通常采用“零点分段”的办法,将带有绝对值符号的代数式在各“取值段”化简,即可去掉绝对值符号.
比如∶化简
时, 可令
和
, 分别求得
,
(称1, 3分别是
和
的零点值), 这样可以就
,
,
三种情况进行讨论∶
(1) 当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c05e9ee5c288be02e7c1f44eef3eff6.png)
(2) 当
时,
;
(3) 当
时,
,所以
就可以化简为 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b48aee1a409bf3e8d59022cb08347a.png)
预备知识3:函数
(b为常数) 称为常数函数,其图象如图③所示.
[知识迁移]
如图④, 直线
与直线
相交于点
,则关于x的不等式.
的解集是 .
[问题解决]:
结合前面的预备知识,我们来研究怎样解不等式
. 在平面直角坐标系内作出函数
的图象,如图⑤. 在同一直角坐标系内再作出直线.
的图象,如图⑥,可以发现函数
与
的图象有两个交点,这两个交点坐标分别是 , ;
通过观察图象,便可得到不等式
的解集. 这个不等式的解集为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30382f6fa9c110d4f63e748aadbd973e.png)
预备知识1:
同学们学习了一元一次方程、一元一次不等式和一次函数,利用这些一次模型和函数的图象,可以解决一系列问题.
图①中给出了函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a7e4dcebd24c843379926de9c0b780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2575e62a7aa12928beee75acc47ba6e0.png)
预备知识2:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcdbe7897e056e32291ef90bff61215.png)
比如∶化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11466de1300f7a674fe0a891431f317d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776b26892877019247c7a50f735b0f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815650356afb1f42207c27d3b11635f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad19ac8fc473d8f1cdc3df5d37539797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ff789744a29f6ed166ced728eb87ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5294800caf4b17e7031d974ff2f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccaa6e503b61e9ae78d8439cba2e328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356d300456f7f1c5fd6c90005aadeedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a7af57545523159f8c77e10f6f915.png)
(1) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccaa6e503b61e9ae78d8439cba2e328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c05e9ee5c288be02e7c1f44eef3eff6.png)
(2) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356d300456f7f1c5fd6c90005aadeedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1667e791c7528974cc11f214448c7e0d.png)
(3) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a7af57545523159f8c77e10f6f915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b17961acbbf575272cfc0ef41446e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11466de1300f7a674fe0a891431f317d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b48aee1a409bf3e8d59022cb08347a.png)
预备知识3:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af79f45b5880c72a349500da9d8e118d.png)
[知识迁移]
如图④, 直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84a4996a0f774a1cfa91e099667256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a46bffe205bdb0a425d98a735f32a11.png)
[问题解决]:
结合前面的预备知识,我们来研究怎样解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee7cbcef1bbecca5c8df176c1c01ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71425b3cb03a6daba73a713bc6373732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71425b3cb03a6daba73a713bc6373732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
通过观察图象,便可得到不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2c940a3352e6f3ff7f41a56e3ca863.png)
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